So the one thing that seemed useful was being able to chat in-game but that only works with people who also have the app installed.
I understand that small indie developer Square Enix's servers are so fragile that an extra byte of information could set the whole building aflame, but SE is just trying to charge me for something apps like Discord do for free.
Why would I want to pay my entire sub again just to do something I could do by just... I don't know, logging in?

What a shameless cashgrab. I hope it flops hard.