Bazzite fills a SteamOS-sized hole with a decent level of hardware support. Unclear how long that'll be the case - I don't see it surviving the release of a GA SteamOS.
i'm still not sure why anyone wants a GA steamos, the value is in the vertical integration, no? the "console experience" are mostly the bigscreen mode and other things already available in things like bazzite, while being a more general distro...
I'm not convinced there will be a GA SteamOS.
Bazzite also has a much more frequent release cadence which is important for the kernel and Mesa. SteamOS only ships a major version every year.