Imo ACC could be a main stat on weapons, and remain secondary on everything else. while you should never hit the cap of the highest content just by having the highest ilevel weapon it should ease things up a bit and reward players with high ilv weapons by taking off acc of their other gear in exchange for "better" stats.
Also tanks could get naturally more acc on their weapons than mages. this would lead to everyone needing around the same additional acc if you compare them class by class