Which distro do you use? I don't really have much sound issues here and I have a pretty exotic setup.

I mostly used AMD Software for instant replay, I miss this loads. Tried replay-sorcery like 3 times, failed all 3 times. I gained more knowledge since, fixed discord’s screenshare, so I might give it another shot, but I also heard that you can get instant replay with OBS somehow.

Yes, I use OBS for that. The feature is called "Replay Buffer" and I have it running with no issues with hardware encoding. I would recommend you use the OBS flatpak, depending on your distro you might also want to use Steam in a Flatpak to make things easier.

I’d like some alternative to fancontrol, I know I could set fanspeed in the bios, idk why I don’t. But I had a nice lil software that managed fans, now I don’t.

I'm not aware of a software that controls all fans but I didn't really look since I just let them do what they want. CoreCtrl can do the GPU fan but I also leave that alone.

Piper also doesn’t support my mouse. It does however support the one I just switched from a month ago…

You might have some luck requesting support for your mouse/keyboard on their git page, maybe support can be added.

Idk what Realtek does, but I never had any sound related problems on windows. AKA it just worked, I’d like it back pls.

What does not work?

I’d still like to fix the bandwidth (I read somewhere that it’s limited by default)

There's no bandwidth limit on Pipewire that I'm aware of. The default sampling rate is 48000 if you mean that but it's a sensible default and you probably don't want to change it.

and mess around with EQs, my lead is AutoEq.

AutoEq sounds good. EasyEffects definitely can do your EQ and much much more.

there is just so little support, paired with such a steep learning curve.

The learning curve can be steep but don't be afraid to ask, there's a lot of helpful people on here. Also most Github/Gitlab projects might look intimidating but they also gladly offer support for applications there.

PDF viewers

Okular is included with KDE and is pretty competent.

Like grep’s powerful, how does regex work, links?, everything in /etc, bash script. hopefully I can get these answered in 2024.

Those are not strictly needed in order to "use" Linux but if you want to learn about them you there's a lot of resources for them out there. ChatGPT is also pretty useful in helping with bash scripts/commands since they're sometimes hard to read.