Resolution is important in VR because you're looking through a lens that magnifies the screen which is right at your eyes, and so, even with 2k/4k screens you can often get a 'screen door' effect, in other words you can see the pixels - and worse you can see the tiny gaps between the pixels - those black areas look like a screen door over the screen. Higher density screens make those gaps disappear (and we're really talking 8k for this)
I get all that, and I've experienced it too (it was definitely noticeable, but to someone whose gaming heyday was facilitated by a 13" B&W portable CRT TV, it was fine), but I'm obviously being characteristically dense and missing something here: why would having a PS4 linked up to a 4K (or 8K) TV have anything to do with the resolution of a VR headset? Surely it has the titchy (relatively!) Low Res screens it has, and that's that. There's no functional relationship, surely?
In my head I'm hearing "I drive a fast car, and I don't recommend getting a bicycle because it's slower". Aren't they doing two separate things, VR and large flat screen gaming? You're trading resolution for the ability to crane your neck in painful directions while screaming "jayzuzfukkkincryst they're-all-over-me!" while your children stare on aghast. Whether you also own, or do not own, a high-res TV for other gaming seems irrelevant. To me.
But as I say, I get the feeling something is sailing over my head waving as it goes by. Is this what it is to be old?