after trip-digit linux installs in the past year or so, here's my list for a seamless transition for people escaping windows/macOS who need to get work done:
1) don't tailor linux to your hardware, do it the other way around. get hardware that works OOB. no nvidia. no latest hardware. no weird realtek chipsets in budget deal-of-the week e-waste, no gaming (i.e. nvidia) laptops.
that don't mean breaking the bank, a thinkpad with 8th gen or newer CPU can be had for $100ish; add $50 or so to expand RAM and storage and that covers like 90% of use cases. a competent all AMD desktop a gen or two behind current tech that can game almost anything can be easily assembled for less than $400.
fedora and adjacent forums are littered with cries for help about stuff breaking or not working at all; 90% of those are nvidia related. can you make it work - absolutely. is that something you're willing to dick around on a deadline - hell nah.
2) no theming. no icons, no fonts, no plymouth screens, nada. as few extensions/plugins as you can, run it as close to stock as possible. shit's gonna break, this is a work device, you can't afford downtime because the single dev maintaining the thingy hasn't updated it for the newest Gnome of Plasma. Gnome don't feel like macOS? you'll get used to it; muscle memory is a removed but it's a tameable one.
an additional moment, especially if you're on a laptop, is to make the thing as fungible as possible. that's an easily breakable/losable thief-magnet, you want a setup that can be reproduced with as little fuss as possible so you can be operational again.
3) don't dual/triple/whatever boot. that's an advanced scenario, it's gonna break eventually and if that's a device you depend on for work or education, you don't want any of that. run it as a single OS occupying the whole disk; encryption on a mobile device is mandatory. if you absolutely need multiple OS, a 2nd device is stupid cheap and it compartmentalises your shit, i.e. one for work, one for private/gaming, etc.
4) no weird distros. no arches, no gentoos, no immutable thisisthefuture shit. when it becomes mainstream, we'll switch. until such time, middle of the road - fedora for newest hardware, mint for ancient stuff, ubuntu for everything else. a lot of people made sure they're operational OOB, it's less likely stuff will break and if it does, there's an army of folks who asked and answered whatever's bothering you.
5) no weird DEs. wayland only, gnome for laptops and tablets, plasma for desktops, there is no third option. you're transitioning from an infinitely polished UI and the best tech that money can buy, you want the closest possible experience and the widest used environment, worked on by the largest dev community aware of the widest possible usability issues, working towards fixing/implementing them. you're already relearning shit, invest that time wisely.
6) separate your system stuff from your applications as much as possible. purge all user-facing apps, like firefox and media players and such from the system's package manager (apt or dnf) and reinstall them from flatpak. that was a headache a few years ago, nowadays almost everything works OOB on wayland. the apps include everything they need to work, the setup is easy to maintain and recreate, upgrades are better (no reboots necessary) and all your settings and data are in one place.
this covered 90% use cases of 90% of the users I've dealt with. naturally, edge cases are gonna have a bad time - you want to ollama this and that and rock bleeding edge hardware and have a normal desktop experience? it's gonna hurt. you need mac-like power management and days away from power? doable but that needs work.
remember, this is a work device. for the same reason you don't decide to "upgrade" the suspension on the car that's supposed to get you to work the morning of, you don't mess with what's likely the only device you need for work/education.
greybeards dunking on you because you're not a "real" linuxer? enamoured with the spicy screenshots from linuxporn? get a $20 thinkpad and go wild - arch it, sway it, have the scrolling text on boot, rice it till it bursts. but leave your workhorse be.
I'm not a Fedora user (Debian and Mint are my go to) but I don't have a similar impression. Also, my own NVIDIA GPU has always worked OOB (even without installing its proprietary drivers, it just works better after installing them) and still is, but it's also considered old being a 970.
Imho, a simpler advice would be along the line of what you mentioned already. Something like: don't rush for the latest/greatest hardware. Often, new stuff will lack support.
I agree with the idea of not wasting time but configuring the theme/look (which is part of the OOB experience, on Mint and Debian at least) can be essential to work in decent conditions.
As a matter of fact, theming is one of the technical reasons why I switched to Linux from Mac. The ability to have the text as large as I wanted it to be: getting older, one slowly realizes that small thin light-greyish designer cherished fonts lose a lot of their appeal in favor of those non-fancy but larger and bolder dark fonts that are more easy to read :p
So, I would object that theming can be a very legit, like 100% legit part of the process of turning a Linux machine into a usable working machine one will be able to work on for hours (like tweaking the keyboard layout would be for anyone, like me, writing in more than one language). And that is not even mentioning people with disabilities.
Unless one has too, sure. Try running any recent edition of Photoshop in Wine and do real paid work...
My own solution was to keep a dedicated machine for anything like that: Photoshop and video. Note that for video one may decide to let go of FCP or Premiere and switch to DaVinci Resolve, instead.
Why would that be a good idea?
I mean, I do my best to avoid all those third-party installer (like Flatpak) because they are not as well integrated to the system as the native installer is (in my case it is 'apt'), and because they also waste much more disk space for the reason that, like you said:
Which, sometimes/often, means a real lot of extra stuff.
That's the exact reason why I use the native installer and not those third-party ones. That and the faultless integration with the system (menus, themes and stuff like that).
And in the odd case I would have to reinstall Linux (an even stranger need on a work machine, since that machine I would not tweak it beyond what I deem necessary for me to be able to, well, work on it and therefore it would be rock stable), even in that case I would need to reinstall it, I find it so quick to reinstall all my apps by typing a single line: "sudo apt install app1 app2 app3 app9999", no matter how many apps.
I am keeping such a list in a text file, I update every time I start using a new app, just in case one of those days I truly am forced to reinstall my system. So, I know it would only be a matter to copy-paste said command line in a new shell. Not pretty but real easy and quick ;)
Once again, I'm not a Fedora user but does Fedora really need to reboot after updating a bunch of apps? I have hard time imagining that.
Sorry if my comments sounds critical, it's not my intention. But while I was reading your post I was very surprised how affirmative you were on certain decisions/choices and how much my own personal experience was different.
And if you're wondering, nope, I am not one of those 'real user' either even though my beard would be grey, if not plain white now... if I had one. I come from 35+ years (happily) using Apple hardware and software for work and for personal stuff ;)
Edit: clarifications.