PC Gaming

#3 is the key I think. Valve's business model is figuring out what their customers want and then providing it to them. Amazon's model is to capture enough market share so they can start the enshitification process.

Heroic is FOSS. They have no money, and still made a better launcher for Epic and Amazon's games than Epic and Amazon can.

Oh they do, frequently

You're not the only one.

Whilst I do have a small collection of games in Steam, my collection of games in GoG is about 30x larger, because I prefer buying from GoG when I have the chance.

As the old saying goes "Possession is 9/10 of the Law" - when the installer of a game is in your hands (kept in storage media under your control) such as with games in physical media or offline installers downloaded from GoG, even if they wanted to take it away from you, they would have to take you to Court for it, whilst if the installer of a game is in somebody else's hands (in Steam's servers or in GoG's servers if you only ever use their launcher and don't download offline installers) they can take it way from you (even what happenned was that they just mistakenly locked you out of your account) and now it's your problem and you have to throw yourself at their mercy to get what's supposedly your stuff back and if that fails take them to Court (which for most people costs more than the games are worth).

It's hilarious that people think "Steam is great" because they don't often lock people out of their game collections or remove games from people's collections and when they do and people throw themselves at their mercy to get it reversed they're generally understanding, when Steam themselves were the ones who created a system where they have all the power and you have none, it's just that so far they've not purposefully abused it and are generally nice when their own mistakes cause problems which one wouldn't have in a different system - they're comparativelly better than most other stores because those other stores are so shit (except GoG, IMHO), but they're still worse than good old physical media when it comes to consumer rights.

Absolutelly, use Steam when it's worth it for you, just do it with your eyes wide open, aware that you're chosing to be at their mercy because the system they designed for digital game sales makes sure all customers are at their mercy, so they're definitelly not your buddies, just (so far) nowhere as abusive as most faceless companies out there.

PS: Back to the post of the OP, amongst all the digital stores with "it's not really yours" systems, with all the power over gamers than entails, Steam are by far the ones that least abuse it (I think they never did on purpose, though some people have been locked out of their accounts and couldn't recover access to them) so comparativelly are way above the rest, especially Amazon as demonstrated by their practices when it comes to digital books.