Yoshi-P: "If you want more engaging content, go play Ultimate"

[Shinkuno]

FFXIV has a vested interest in keeping their old content clearable just because synced content is a major selling point of the game.
It would be bad optics to just have synced minimum ilvl, no echo to be unclearable because of the new design.
"Oh SE ruined healers now!!!!! It's bad!!!!" would fill every reddit thread, twitter thread, forum posts and pf post for like 2 expansions.

This argument goes well out the window when you realized doing content synced is not even an inch comparable to how it was when it was current.
Missing skills + higher potency and you just cruise through them pressing 5 buttons.