Arch w/ KDE gamer here. I have generally had a good experience with it. I think everything you said is generally accurate. In terms of customization, lack of bloat, and a good wiki, Arch is generally considered to be all of those things. A rolling distro like Arch I believe will also be getting the latest proton updates, which may help with sooner game compatibility/optimization updates on more recent releases.

I say go for it.