Personal preference really does seem to be what this all boils down to, rather than the actual nature of the games. Let's take your list for example.
Something like Project Cars is easily more fleshed out than Gran Turismo Sport is going to be (hell, it looking somewhat like a Prologue entry is what the game is catching most flack for). Hell, moreso than GTS and Driveclub combined will probably be. And that's not taking into account how the majority of standard racers on PC are VR candidates, rather than a select few developed with it in mind.
Elite Dangerous is massively more fleshed out than Ace Combat 7 will be (AC7 being the main reason I have a PSVR on order). Eve Valkyrie is already up for the Rift, so that doesn't really need addressing.
You talk about Edge of Nowhere being a 4-5hr on rails experience, yet how would you classify Rez?
Rigs and Battlezone both looks cool, but they're are just as arcade-like as many of the current VR offerings. There's really not the sort of depth divide that you appear to be suggesting.
Sorry for the late reply.
For me, it has more to do with the fact that I do not feel that Rez has been shaped to fit VR (obviously, since Rez is Rez). I don't want to play a game like Edge of Nowhere, an adventure game that offers less than it's contemporaries just because it features VR, that doesn't interest me.
Rigs might be arcade like, but it has more gameplay depth and sustainability than the majority of experiences currently on offer. They are building it up to be an esport, and it has a single player career structure like the EA sports games. It seems very in-depth for that type of experience. I'm also super interested in how the controls will work and whether head controlled aiming or eye tracked aiming can be competitive.
I think Project Cars is bad as a racing simulator, it has nothing to do with the body of content, it's just my personal preference, but obviously my decision is not devoid of that influence. I never professed what I say to be objectively correct, I just prefer GT over Project Cars. It's also the fact that I will also have GT and Driveclub to play on the same system... sim and arcade together, both at a very high quality, accessible at launch. I don't think that's available on Occulus right now.
Elite Dangeous and Ace Combat are not especially similar, Elite is appealing, in its own right and I agree that it's one of the games that suits VR very well without feeling almost hindered by it, but they are completely different experiences. As for Battlezone, it's more to do with the fact that I feel that Battlezone isn't less than it would otherwise be, because of VR. With games like Edge of Nowhere, I know Insomniac could produce a much better action adventure experience, without VR, it feels as though we're regressing from more fleshed out experiences, just to fit VR. With something like Battlezone or REZ, VR feels like a nice fit, as it doesn't seem as though it would take anything from the experience to be a high quality VR experience, quite the opposite in fact.
Then there's the other titles I mentioned, Supehyper cube, which is doing some pretty neat things with perspective that are achievable only because of VR. It's a neat concept for a game that's offering a lot more than just immersion at the cost of everything else.