I would actually like to see some numbers or a survey on how many people actually do this. Anecdotally I don't think I know a single person who ever verifies safety numbers out of band. Of the approximately 50 people I use to talk on signal with regularly not including large group chats of people I don't know as well, not a single person has ever tried to reverify me nor have I tried to reverify any of them.

Would be cool to see what the numbers are for reverifications.