WoW plays entirely different than Istaria. In WoW, this sort of "crafting" that exists there needs intense time on farming which slows your leveling down. I like the Istarian craft system more as it is truely indifferent to your adventuring and does, in fact, not hinder that.
If you don't want to lose time leveling your craft in WoW, you'll surely spend much gold, which is not that nice.
In Istaria, on the other hand, virtually every craft ingredient is easily gatherable. This is not the case in WoW.