Yes, engineering is a big advantage and that isn't 'fair' (although nothing is stopping everyone from having it, except for time investment but time = reward).
Wow is an MMO and concepts of fairness and people moaning over a perceived lack of it are, in part at least, what has lead to the homogenised shit show we have today where balance / fairness have been taking precedent over fun for years.
My most enjoyable seasons in arena have mostly been the ones that weren't particularly balanced or fair but were very fun (e.g. s5 RMP with triple gnomish lighting generator? s8 shadowmourne TSG / wiz cleaves ).