Apple definitely need that higher resolution to sell you their illusion. As we know Apple are trying to immerse the user in a 1:1 realtime recreation of their actual surroundings and this needs to be as pin-sharp and smooth as IRL.

The human eye is however estimated to see in a resolution of about 64k (actually 576mpx) so they’ve a long way to go before getting to the quality of actual reality. We may have transparent displays before then that render the idea moot.