Firefox (well, librewolf, but forks are a matter of personal preference).
Chrome (Ungoogled chromium) is used as a fallback for the occasional site that doesn’t work with my restrictive FF configuration.
Both have uBlock, though they’re configured differently to suit their individual purposes.
You can tell git to use a specific key for each repo. I have the same situation as you and this is how I handle it.
https://superuser.com/questions/232373/how-to-tell-git-which-private-key-to-use
Docker, using the nextcloud:stable image (not-all in-one) with postgres, behind nginx, and finally ZFS with 2x modern HDDs for storage. I run the stock apps plus a small handful, and have carried the same database through many versions over the last 5 years.
It’s usable, but definitely not snappy.
The web interface for files is fine. Not instantaneous at all but not a huge problem. I have about 1TB of files (images and videos) in one folder, then varying files everywhere else. I suspect that the number of files (but probably not the size) is causing the slowdown.
Switching to, for example, the notes app is incredibly slow, and the NC Android app is just as bad.
As a heads up, EDMC runs natively on Linux well, or at least it did the last time I used it. See https://github.com/EDCD/EDMarketConnector/wiki/Installation-&-Setup#linux-with-steam-play
Since you’ve got it running in wine just fine, I personally wouldn’t change anything, but if you have issues in the future, you can try that.
It’s exceedingly rare, but there’s one case where a game can disappear from your Steam library: keys.
Game developers/publishers have the ability to revoke keys at any point, and that can result in games disappearing from your library.
I’m yet to hear of Valve themselves making a purchase inaccessible, but I have had keys get revoked. For example, free Gleam keys that add shovelware to your library.
Even games that Valve banned from sale on Steam can be activated and added to your account using keys. I believe that people who purchased the game also get to keep their purchase even if it’s later banned from sale.
Arch, because I use niche software and the AUR doesn’t always get along with Manjaro very well (ungoogled-chromium-bin is the worst offender). Switched to arch, configured it identically to my manjaro install, and all has been well.