Level sync that you're only allowed to sync within a level range (the same range as the SP bonus perhaps). This would be the best of both worlds.
You guys should start finding ways of compromising & thinking up systems that can accommodate both ways.

Level sync talk is boring anyway. Might as well add it since people are already powerleveling on their 50's(and whatnot) at this point in our low/antisocial population. If it gives more options for interaction, then it certainly is better than anything we have now.

Shouldn't you guys be arguing over the future dungeon finder system? It's so bad seeing people get impatient after 1-2 minutes after joining a party and then flaking out. These attention spans are horrific.
There should be some kind of a "you are now committed to this group" for our future system.
Don't let them queue for like 30min-1hr if they want to queue up and then flake out (or whatever works).

Maybe if there were more incentives for endgame, then people wouldn't need to make a fuss over grinding. For me, as long as the journey takes us across the world throughout leveling, then it's good to go, how i level doesn't really matter if it's social & fun.