I mean if you're happy with stereo that's fine. I think it's poor compared to almost all the surround recordings I've heard. It's very rare I even want to bother listening to a stereo recording ever again once I've heard a surround version. So yeah, I would like to have access to it on the go, and I would like there to be more content recorded/mixed that way, as right now there's only a really large library of surround classical, other genres don't have that much. I also think it's a way easier thing to sell to the mainstream if you can get it right on headphones, as the differences are immediately obvious and audible, unlike hi-res audio which is completely pointless.
Tidal has a partnership with Dolby Labs
to mix and host Atmos music, yes. I think TIDAL's handling(most of?) the mixing and mastering of these albums, but Dolby might be paying for it, it's not completely clear. Not that important though. They also have released some older mixes done by other studios, like 2L. You can play Tidal Atmos tracks on any music system that will handle the playback, so AVRs etc. There isn't that much yet but they're consistently releasing a few albums every month.
Here's
a playlist of things I've liked the most, for anyone that's interested.