Why can't sync just affect gear and stats...?

[Ammokkx]

I just find it very confusing that you prefer the idea of pressing 1-2 throughout 20 straight minutes rather than play with your actual rotations against properly scaled mobs and bosses.

Nobody prefers that idea. We accept it as a reality because newbies should have the same tools you do at the time they do the content.

If you want to only ever use your level 80 toolkit, please only make it so you only ever do level 80 content. You should not have a spell you unlocked at level 64 available when your character is temporarily put to level 18. Period.