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I don’t think one can really compare the games on iOS to those on Steam.

No, but you also couldn’t compare games on prior mobile devices to those which iOS enabled.

I think the more appropriate thing to consider is that Apple has a lot of Developers familiar with its platform

The Oculus Quest has shown that a lot of people are very happy playing 'iOS' quality games on VR.

The Oculus Quest can also be used to play PCVR games.