I find it very sad, even simple things like font you have to log out............
There are MMO's in which you can change just about every single setting without restarting, it just rerenders on the spot (causes a little stall for a second but better than relogging)
I say if 1 game/studio can do it, there is absolute no reason another cannot and its inexcusable to not have these as standard.
But it probably wont come for a while, due to XIV's bad design/development and it will be related to the whole DirectX loss.