VR is a MUST to have at least 90fps, this is why PS VR have lower graphics than regular version. This is because the eyes will watch only at the visor, and having less than 90 will give motion sickness as the refresh rate of the screen is lower than human eye. Doesn't happen in a regular TV/monitor as the eye still have spatial fps of what happens around the screen.
PC VR have same graphic as the regular playstyle, but at the cost of needing a powerfull PC, and this is why there are SteamVRReady programs etc. If you don't match the criteria, you have to upgrade the hardware. The only thing you could do on console, is to upgrade from fat/slim version to PRO, but there's nothing you can really touch on it.
I am one of those that would like to get 60 fps as I know which there are huge differences, but I'm also aware that if a game is really well done and can keep 30fps stable, also the latter is enough. Just look at Horizon: Zero Dawn.