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.
Since they’re all designed to work together as a trio, surely it makes sense to include them all? And it’s not a forever decision, they can always branch off later if it becomes clear enough people are interested in one or the other to support their own communities.