Since getting my Frame I think I've spent more time playing Super Mario Galaxy 2 in 3D than I have doing anything else. 3D in a window is much easier to deal with then full VR from a motion sickness perspective.
I think the VR space made an unforced error by focusing a bit too much on VR and not enough on just plain 3D. VR is cool and it has a lot of interesting applications. But I've enjoyed my time with SMG2 in a 3D window quite a bit. I've enjoyed Triangle Strategy on my Quest 3S, which is a tactics game played on a diorama. There are some other applications based on the idea like shared dungeon crawlers modeled on table-top layouts rather than first person perspective. There's a lot of games that need only minimal tweaking or fiddling that could add a bit more visual interest by being displayed in full, true 3D. The space of games that could be improved by just being playable in 3D is much larger than the space of games that can be improved by VR specifically, since the former is a superset of the latter.
Subconsciously it may feel like if you're developing for a "VR" headset, it ought to be "VR", but that's not the case. It's a well-known trap in gaming in general that when some new tech comes out there's a rush of things that feel obligated to "exploit" the tech so as not to be perceived as being behind the times, but it always becomes clear that is not necessarily. Most famously, the numerous Wii games that had to integrate "motion controls" and turned a nice, easy, concrete button press into a vague, nondeterministic "waggle" until just saying "motion controls" with a certain inflection has become a meme. There's no problem using the VR headset to enhance a game... or indeed any application... without it having to be "VR".
My Steam Frame was cheaper than this 57" curved "gaming" monitor: https://www.amazon.com/dp/B0CDQM55C9 If gamers are willing to drop that on nice monitors just to play games, it would make sense to drop that much on a VR headset to play them in 3D too... if there was anything to do with that.