Doesn't make sense for FFXIV.

WoW's expansions are temporally confusing and completely disjointed. Speeding leveling only made this more problematic as you never actually finished any stories before moving on.

FFXIV is very strictly linear. It flows. You are required to take this singular path and see it through to completion. There are no problems generated by this process that would be "solved" by a level squish. Any "fix" would be entirely cosmetic as the same amount of content will be waiting for you regardless.