Not OP but:
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on a desktop it’s defaulted to desktop mode. I’m unsure about the steam deck.
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you choose. KDE or GNOME. Budgie is being worked on.
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lutris can install your windows executables. Bottles is available too.
The only games I’m unable to play so far have been AAA games with unfriendly anticheat. ProtonDB helps here.
I have been using the hell out of bazzite for the last few weeks and I’ve really enjoyed it. There have been a couple of minor bugs but otherwise everything just generally works.
I’ve enjoyed it so much that I’ve also installed bluefin on my work laptop.