I think it's possible that the majority of tech workers aren't hoppers, but the majority of applicants are. This just stands to reason, since hoppers aren't doing much applying and interviewing. This would tend to make interviewers thing that this is a dominant strategy even if it isn't really.

It's also the case that the "everything is transactional, fuck your coworkers, leave your job the minute you can plausibly say you learned something and move on, chase impact at any cost because you only have one career" live-to-work contingent is just much louder online, especially here. After all, these are people that are investing a lot in their career, while IME most of my coworkers, even managers (though I don't personally know very many VP-and-up managers) are work-to-live people, mostly interested in their families and hobbies, and seem to rarely post on forums like this.

In any case, I'm fairly certain that there are (or were until recently) Labor Department researchers who have figured this all out empirically and could give us an answer if we knew where to look.