In my experience they always find something that they "have time to take care of right now if you want". I've heard anecdotes of folks going to get second opinions that reaches a different conclusion.
I went to another dentist in the area, they took some x-rays themselves, and told me that there was nothing that needed immediate work - maybe one pre-cavity that would eventually turn in to something but certainly not worth doing anything with now.
Three years later (and sticking with that new dentist) I still haven't needed to have anything done (and certainly don't have any pain in my mouth anywhere either).
The root canal was eight years ago. I brush and floss twice a day (brushing without flossing feels weird to me now). I haven't been to the dentist since before the pandemic and my teeth feel completely fine.