the "legit" guilds that dont allow dks usually dont allow lk gems (or any bc+ gear), enchants, or lk/cata tinkers. i think some allow ally sham or horde palies just b/c the tier drops on both sides, even if they werent originally available
however i cant see why a casual 60 guild wouldnt allow them. i mean the leveling out thing does make a bit of sense, but dont let a few bad examples spoil it for anyone that would want to make a dedicated dk. people going 1-60 might be a bit more "dedicated" to their toon, but thats just a generality...im sure there are quite a few people that lvl 1-60 then get burnt out and decide to lvl out after getting all their t2.5 n other stuff, or once they make a legendary, etc
gear would suck a bit tho just relying on those non tier plate items, but there is gear out there so itd just take a bit of time/luck. in the mean time tho they'd be a bit OP in the starter gear cuz that was supposed to be almost as good if not better than bwl gear iirc (if say, in a guild thats in mc progression), so unless they downgraded gear they would have an advantage out of the gate..but still, for a casual guild it shouldnt matter too much considering all the player buffs and boss nerfs in vanilla content anyways
as far as pvp goes i think dks are a lot more toned down/not as op than when lk first launched, and even then i think they were causing the most headaches in the 59 bracket, but idk. also for pvp youd be using bc/starter gear in a lot, if not all, of your slots making it not that important to get vanilla gear in the first placel other than maybe one or two slots, or just the epeen of getting all the old gear for looks
