Hinting/antialiasing settings are not updated in real-time
Instead those settings are updated just after some time/after a reboot (without any warning that they need the user to logout to be applied).
This is a quite serious drawback, because it does not allow the user to see which one effectively looks better on their screen and/or have any kind of "preview". Whether this belongs here or to Mutter (maybe better) is up to how a solution will be implemented