Unfortunately, this is a balmung issue due to it's huge popularity. And yes, S-E should eventually fix this but the playerbase is also to blame for mass gathering on one specific server. (Doesn't also help that Gilgamesh also is on the same data center and has a lot of people)

But honestly though, I've played on different servers in the past. Mostly because of rl friends joining ffxiv later and refusing to join me on balmung. And I have to say that Balmung community is great lol. (There's obviously the usual bad apples)
I found the other servers to be so boring. Nobody, talking in say or shout from time to time. Empty city states.

The benefit of being on a rp server, is that every location has people. Making the game feel more alive.