The consequences could look something like 50 shift workers showing up an hour late one day, or a user missing a critical meeting.

Dealing with and debugging time zones is already such a confusing mess that I find that anything that makes your application more correct with regards to time zones is worth it. The important thing though is knowing, and then you can make an informed decision on how may shortcuts you want to take with time zones.

If you’re writing software that’s only designed to be used in a small region or by just a few people, then sure, it’s probably not super important.

If you’re writing software that’s used all over the map in places and time zones you can’t predict, well, it helps me sleep better at night.