And do you think that will matter in the near future? Because every app developer will just set their apps to use the highest attestation requirement by default and every normal android phone will pass that test. The few percent of people that use something else can just fuck off.

I don't think so. Google is poisoning the well with their developer policies and play store controls. The time is ripe for a competitor, and if there's a credible competitor that demonstrates the "good because goog says so" model is broken, that will force fully open attestation.