I agree! And at the very least it would be nice to be able to use all the skills you have currently unlocked at your level when you get synced to a lower level.

For example, lets say my PLD is level 50 and I queue for leveling roulette and get Sastasha which syncs you to around level 16. Since I've leveled PLD to level 50 and unlocked all the skills up to that point, I'm now able to use Circle of Scorn and all other skills up to that point while synced to level 16.

Of course they would have to balance this, but it would make level syncing to lower levels way more interesting and fun to do.