[paulryanrogers]

Internally they are with Pg. In practice non-TZ columns can go sideways. For example your app or ORM starts trying to store local time (Pg cannot know to save equivalent UTC), so now you've no way to correct and Pg cannot either. Or the DB config gets switched to non-UTC, again you may have no recourse.

I've seen both these things happen at companies. Often users don't care or notice for a long time, until suddenly they do and you're painted into a corner.