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voted for yes!

I would like this in theory, but I'm not sure how it would work in practice, especially as there are some games tagged as VR on Steam that only have optional VR support but don't require it...

Already suggested before, also might be your own responsibility to check what you actually enter for.

It's an impossible suggestion.

and what to do with games like Serious Sam where u can play with VR/without VR?
Also as Lugum said, this suggested before