the problem is that they need to detach access to zones and non msq questlines from MSQ and make them level based instead.

for instance raids and such, if your level 90 but still in ARR then you should still be able to travel to zones and pick up quests to unlock grp content.

the game forces you to rush a 2 month long quest line to play with friends, let us do the quest at our own pace, but allow us to unlock things separately even if its spoilers, we are big boys and girls, we can make that choice ourselves.