Stat squish confirmed: How will unsynced old content be handled?

[Absurdity]

Syncked duties that also iLv synck you will probably feel the same, because your relative power level now will be about the same as your relative power level post-squish. Strictly speaking we will be slightly less overpowered across all the cap level content, but it probably won't be noticeable except at the lower end of each level cap.

For example, Labyrinth of the Ancients, Void Ark, and Rabanastre should be harder than they are now, to some degree; while World of Darkness, Dun Scaith, and Monastery, will be about the same as they are now.

But again, this all depends on exactly what the new curve will look like, so we won't know the real impact until Fall.

It also heavily depends on the job changes. While ilvl does make the old content easier the biggest reason why alliance raids like LotA, Void Ark, etc are such an easy snoozefest now is because of the potency changes SE has made over the years to compensate for removed mechanics or because they were needed to balance jobs at max level. Overall our character's abilities simply deal more damage at level 50 now than they did in ARR.