Experience Changes in 6.0
In Endwalker, Square-Enix will be implementing a stat squish. Accompanying the stat squish will be an experience squish. This squish will reduce any gained XP in a level to 0. Please take this into consideration as Endwalker draws near so that you do not lose any significant amount of XP.
Commentary
As a commentary however, the explanation given as to why they must do this feels very lazy. This exact change was made in World of Warcraft for Shadowlands, but instead of reducing experience to zero for a level, they just flat capped it at max if it would’ve given a level. But given how many of FFXIV’s quests and experience-giving elements are, you would think they’d treat experience as a percentage of level. That could have led to this being a non-issue in 6.0.