I tend to agree with identifications a specialist (for example, an entomologist’s id on a picture of a beetle) has made. Doing so generally just moves my tentative genus- or family-level identification to a lower taxon that seems more appropriate to me as well. But to do that, I usually need to go to the identifier’s profile and see what they’ve said about themselves. I’m more wary about agreeing with an id from an undergrad or amateur enthusiast. Maybe I shouldn’t agree with anyone at all? I’m not sure.
EDIT: never mind, many people have debated this topic before https://forum.inaturalist.org/t/agreeing-with-experts-and-research-grade/ and I doubt there will ever be a consensus on what’s the correct way to go about it; I don’t think a concrete rule would be best, anyway, because some taxa are simply easier to id than others.