Mail and leather have it worst.
Enhancement and ferals can freely need on int gear because it's for DPS role too.
Moonkins and ele's can roll on agi gear with the same reasoning.
While restors are locked into int-only and bears into agi-only.
With cloth all the gear really is useful for all the specs. It's the least crazy armor type with that system - it will just be never affected. (which retains all the old problems with spirited mages and warlocks)