Nah, Bitwarden is what I use. It has a free tier and a paid tier for $10/year that adds some extra features. You can read about both on their website.
You can also autofill on mobile and desktop with the mobile app and browser extension respectively (the mobile app also let’s you autofill in any app that requires a login, which is nice)
Fellow Linux noob, just started using it earlier this year so if someone with more experience wants to weigh in, please do.
That said, gaming on Linux is pretty good. Steam’s proton makes most games playable out of the box, although it’s still a good idea to check Proton DB to see if any particular game you want to play is playable.
As for your other question, I’m not totally sure what you mean by accessible and customizable, but I don’t think any of your peripherals are going to be distro locked. The Arch Wiki is a pretty good resource for, well, everything, but most relevant to you for your peripherals (it also usually gives good information for any distro, not just arch)