SteamOS works great for the steam deck, there really aren't any extra features that I can think of that are useful from bazzite. Updates happen often enough... There's just not really any reason to go through the effort of changing to bazzite and reinstalling everything, but I guess it shouldn't hurt either.

It's not always preferable to be constantly updating to the most bleeding edge available... On the contrary, for something like a handheld gaming device I think stability is a bigger priority. Most of the updates that might, for example, make a game start working better, will be from Proton anyway, and your choice of OS makes no difference to how fast you get those, they're either from Steam or the ProtonUp app, which will get you the latest custom versions from GloriousEggroll.