It'll never happen, full stop. Given Yoshi-P has said countless times he wants everyone of the same job to be able to perform at the same output at any given level, there's far too many variables and problems to reconcile to make such a system possible without nerfing every single OGCD the job normally doesn't have at the level into dust that they might as well not exist. Take for example, hallowed ground. How do you reconcile the fact a level 30 PLD can't use it? Do you make it reduce damage by 1 so its non-existent to account for that fact? Keep in mind, Yoshi-P's requirement that two jobs of the same level must be able to perform the same, so letting the 90 PLD have it with any sort of immunity or even any sort of damage % reduction breaks that requirement.

This topic has come up again and again since HW. The devs have commented on it several times and saying no every time. The level sync won't ever change, full stop. It's too much of a hassle and a nightmare to balance when their current system works flawlessly for the purpose they want it to achieve in a massively tiny fraction of the effort, that also doubles as not needing to be changed expansion after expansion, whereas any formulas, scalings, etc would have to be adjusted any. single. time there's a change to any potency on any job, or radical toolkit changes each expansion. The devs know it'll be a colossal waste of their time to entertain giving people their skills back for even a nanosecond.

You're better off asking for an ability level squish. Give more tools to the player quicker. that way two jobs of the same level will be able to perform at the same strength due to matching toolkits in any instance, but everyone will have access to more skills quicker.