My initial thought is definitely yes for the Steam Machine, and maybe yes for the Steam Frame.
All devices are Valve made hardware running steamOS, so I would think a lot of the discussions/content would apply to Steam Deck. This also isn’t a super busy community, so I wouldn’t be that worried about Steam Deck specific content getting buried.
The Steam Frame is a bit more iffy than the Steam Machine though, there’s a lot of experience differences between the Deck/Machine and a VR device, so there will be larger differences. Also the Frame has ARM hardware and has to use an additional x86 to ARM compatibility layer for games running on it, so we’ll probably see some unique compatibility bugs for it.
Overall though I just want to hear everyone else’s opinions on it.
I’d suggest a separate community for each hardware variant and a Steam OS community acting as a broader hardware indifferent Steam gaming community (which I believe exists already)
this is just a forwardlooking estimation that it will be easier for moderation.