If you think Dawntrail dungeons are based around random rapid aoes it's because you're only looking for floor telegraphs to move out of and not at everything else in the room. Try reading cast bars, watching the boss animations and keeping an eye on knockback directions or additional enemies/objects outside of the arena. If the orange flashes under you and snapshots instantly it's not because you were 60 and lacked basic motor functions and reaction timing to move out of the aoe - it's because the aoe was already impossible to avoid. You missed information the game was trying to communicate through gameplay languages outside of "orange bad".
Claiming your FC had members who couldn't clear the Dawntrail dungeons is the biggest "never happened" story I've heard about XIV this month.