Can answer to the second point. I like to pencil sketch and have used the RM2 for this as well. At a hobby level, it's pretty good, almost like pencil on paper.
The only cons I've found vs paper: It lacks some of the finesse/precision of a real pencil (even with the 4096 supported pressure levels), and you can't smudge the graphite with your finger as you might do on paper to make a fill smoother (maybe there is a function that I'm not aware of?).
Plenty of writers use the reMarkable. If you prefer typing text for your first draft you do it in new documents on the device and then you can copy the text from the PC rM app, once downloaded onto your PC, and paste it into Scrivener or Word, or wherever you like to edit. Be aware that the width of the page you’re typing on feels narrow but you can keep typing on one infinite page. I hand write my brainstorming notes then my first drafts, then type up my chapters in separate note documents so they don’t get too big to copy paste. The documents all go in a folder with the title and I load research/article pdfs from my Mac into the same folder, so it almost feels like Scrivener. There is even a scene cards template you can use. It works brilliantly as a distraction free typing device and so much more.
If keyboard is the big thing, I suggest a FreeWrite. They're wonderful. Word-count goes way up. (I own the Traveller.)
This annoyingly looks exactly what I'm after... Only downside is I could get a moderate laptop for the same price that does more - I appreciate it's specifically made to ease distractions but the price tag seems mental!
Never heard of this, I'll check it out