I did say ''see'', not ''read''. Did you have to do old content for blood elves, draenei, worgen, goblins or pandaren? Nope. People will assume you wont have to for allied races.
Levelling twice for one character is retarded.
Content is old when there is something newer. Doesn't matter if somebody hasn't experienced it yet. And yeah, pretty much the entire game revolves about gearing up, so I would say everything below levelcap is rather irrelevant.
Mark my words, it will not stay like this when BFA launches