Yes. I think it's something that isnt used as widely as it should be. I mean especially people with a large audience (these are the ones to be mostly impostered) often do have domains that are well known and prove a npub belongs to them. But you are right that it's no guarantee people don't fall for other accounts that look valid. I think it's up to the community to call (obvious) imposters out.

Besides I don't have the feeling the problem is solved on centralized media. DerGigil 😅 just followed me yesterday on Xitter.