Well, those things can be added:

    - opening_hours=*
    - amenity=cafe
    - website:menu=*

But they can easily become outdated again. Still, local QA via StreetComplete, MapComplete, EveryDoor and a multitude of other apps is always needed.

It is a very good point though, Honestly we should have tried to solve that. It is badly needed in a map nowdays. At the moment there is no way to map or display these things and I think there should be.

How so? They have a way of storing that specific information, so why shouldn't we (in part) judge it by the completeness of the information they allow people to store?