Here is a screenshot of my character comparing how bad it is with "Dawntrail Glare:Low" versus "Endwalker Glare: Off".
All light sources in Dawntrail have a very strong bright halo effect, now imagine it all over the screen in raids or towns (gold saucer comes to mind), no wonder i've been having headaches.
And no matter the ingame time of day the halo is allways present even if you don't immediately notice it.
Now put the motion blur of DLSS/FSR on top of it, i think i don't need to say more.