I'm talking about a game that makes people sit up and take notice and think "I have to get VR". Yes all the things you mentioned are fun but they are not HMD shifters. Where Half Life had me purchase my first PC, there does not exist such a game for either Rift or Vive.All gaming is subjective, some gamers didn't like any of the Witcher games or Skyrim yet people would class them as platform defining games. I don't even like Lone Echo, Echo Arena or Project cars but I would be fool to deny the impact they have had in VR gaming. I don't know how much more platform defining you can get than those games.
If you got bored of it, fine, happens us all, but to say "no platform defining games" is not really true. I mean if you haven't touched the Vive in over 1.5 years, then you haven't played Robo Recall, Lone Echo, Echo Arena, Moss, Budget Cuts, Beat Saber, Skyrim VR, Star Trek Bridge Crew and so much more. Oh man, you have missed out on so much!! Not to mention all the improvements that have come to other games.
I played the early access of Robo Recall, it was just a generic stand-spin-shoot like Brookhaven. Budget Cuts demo was fun, had promise, but it was too long in development and I haven't heard anyone rave about it since it was released. Bridge Crew sounds unique but not my cuppa.
The things that have blown me away with the device were: the Oculus dreamdeck vignette (its the one I always showed new people, even on vive), The Lab, Accounting, and Lost. All of those are really really short experiences that you rarely go back to (except The Lab, I played with the blow and arrow a lot).
Rec Room and AltSpaceVR have made the best attempt at something persistent and worth going back to, but they're attempting to recreate real-life inside VR.
If Valve deliver on their promise of 3 VR-only games I will sit up and take notice again.