Given the wild success of Shadowbringers, and EW having those massive queue problems, I can understand the desire to make the extra server. It wasn't a bad idea at the time.
Unfortunately DT seriously dropped the ball--in MSQ, in gameplay, while WoW has had its first (as I understand it) properly successful expansion since Legion. FF14 is trending down, WoW is trending up. A fair few of the refugees are going back to their old flame.
