I think you are addressing the issues wrong.
Unsupported hardware is a reality in Linux, even if I didn't find any in the last 10+ years, my needs are much more limited.
Controllers do work just fine, as well as Bluetooth, in my experience. Maybe share some issues and let's see why.
Troubleshooting in Linux means understand why stuff don't work as you expect, not copypasta 50 different solutions. There are 50 solutions because there are 100 ways to do stuff and different distros and versions out there. The "unified" experience is from the windows world, not the Linux world.
Nvidia is a known issue on Linux, prrprietary drivers kind of sucks and there are no good open ones, at least for newish nvidia cards. But again, my experience with nvidia has always been very good, with proprietary drivers.
Steam, I used it trough wine to run windows games on Linux, with good success (1 game, so YMMV), and I found it amazing that it was even possible to do. But never used controllers