Ironically enough just 2 days ago I posted this https://lemmy.ml/post/20691536/13906950 namely how the 1st thing I do after installing NVIDIA drivers on Debian is disabling Wayland to rely on X11 simply because it doesn't work.
Sadly that's relevant here precisely because if we are talking about Valve it's about gaming, if it's about gaming one simply can't ignore the state of NVIDIA drivers.
So... it might run on 50% on Linux desktops but on mine, which I also game on, it never worked once I had drivers for gaming installed. Consequently I understand "how people are complaining" because that's exactly my experience.
I forgot the exact number but while installing Debian (Bookworm and Sid) this weekend I was shocked by how small the base install, with a window manager ("big" one by your standards, i.e KDE), was. Maybe 2Gb, definitely less than 4Gb. It all worked fine, I could browse the Web, print, edit rich text, watch video, etc.
I installed a ton more stuff since, e.g Steam, Inkscape, Python libraries for computer vision, etc and it's still not even 10Gb.
So... my suggestion is the same as I shared earlier in https://lemmy.ml/post/20673461/13899831 namely do NOT install preemptively! Assuming you have a fast and stable connection I would argue stick to the bare minimum and all add as you need.
In fact... if you want to be minimalist I would suggest to do another fresh install (it's fast, less than 1hr and you can do something else at the same time) and stick to the bare minimum right away.
TL;DR: don't get rid of, just avoid adding from the first place.