A naive CRUD may accept local times to make things easier for users, not realizing the DB needs UTC. Juniors often commit this error unless told ahead of time. Then you may have weeks or months of data that is wrong and possibly values from many zones.

Yes, people will do anything if their systems and tools allow them to do it, either by ignorance or to facilitate them their current task. Both create tech debt and timestamp tech debt is one that is hard to pay.