So, I know that part of the process when adding new skills in expansions is cutting down on previous skills that aren't very relevant anymore. But this has the adverse effect of making old content feel very hollow and some of the hard content impossible to do without unsyncing it.

So, I had this thought... what if your job crystal determined what skills you had, depending on your level? When you're between level 1 and level 60, you're job crystal is "synced" to what it would have been like in Heavensward, with all of the skills that they had during that expansion. Once you're past that, your job upgrades to a Stormblood crystal and some of the older skills are removed or altered in favor of the new skills.

Or, something like that... it's just a thought that I had, regarding how boring old content feels sometimes because a lot of the low level skills being removed or homogenized for the sake of the end game.