fwiw I’m running Debian 12 and had no issues getting steam to run, and all games I’ve tried run great (with a few exceptions but not many).

I really really wouldn’t recommend Debian as an OS for games. It’s a server/workstation OS. I use it because I like Debian, not because it’s a good idea.

I remember changing my grub config to pass arguments to the kernel for gaming performance. I bet you wouldn’t need to do this on a distro designed for gaming like Bazzite.