Bazzite provides a Steam-OS gaming-centric interface out of the box. How are you going to upstream that? You think Debian stable is going to agree all of a sudden provide it's users a gaming console UI?
It's an entire login session, steam game mode runs BPM via the game scope compositor, no desktop is loaded in the background, etc. The Steam client also enables hardware controls not available in traditional BPM.
You can look up gamescope-session for more info.
Its something that I generally wouldn't expect on traditional mainstream distros.
Debian -- probably not, but Ubuntu has numerous variants whose primary purpose is providing a different desktop experience, and a SteamOS-like variant would fit in perfectly with that.
That’d still come with the limits brought by the old kernels Ubuntu ships.
Which as an aside, I think distros should advertise better. It must be awful to be sold on a distro only to find that it doesn’t support your newish hardware. A simple list of supported hardware linked on the features and download pages would suffice but a little executable tool that will tell you if your box’s hardware is supported would be even better.
