While a lot of people have suggested that we should just keep our entire kit as we level all the way down, it's clear that SE's design won't accommodate that without a lot of changes. However, I believe there's a middle ground where we sink to specific points rather than exact levels.

Instead of syncing to a kit that's within five levels of the dungeon or FATE you would sync up to the max level of that expansion's content, with an additional sync point at level 30, for content below that level. Level 30 has always been a special level FFXIV as that's where Heavensward jobs start. It's also far enough along that you should have enough of your kit to be interesting.

To be clear though, you would only sink up to a level you had earned and not above, so a level 15 rogue is not going to sync up to level 30 in the starting dungeons.

The main benefit of this is that SE can focus on creating a compelling low-level job experience at level 30 including an AOE kit and any other role-critical skills.