> scrap #2 entirely it means nothing to me.

NIP05 is an effective way to validate if a person still controls the key you thought they controlled. Otherwise, how are you making sure you are still talking to the same person and not an attacker that has taken over that account?

> 3 should just be a blurred image/video with a warning ...

Then everything would be blurred because most images on your feed are just unverifiable as opposed to NIP-94 or 95 images.