Most of us know that the Level Sync system were removed from the chinese version of the game.
I'd like to propose something similar, but not that game breaking.

I think everyone agree that doing lower level content once you reach 70 is somewhat boring. You learn all your rotations and skills, then you queue up for Roulettes. There, you feel incomplete, lacking all the abilities you worked so hard for.

Since we already get "synced" down, why can't we use all the skills we already got? Doing Sastasha is a torture!

We'll be weaker, but still have access to normal rotations, being able to imput some extra damage, nothing too powerful.