Warriors are not hybrids .... The same as Priests were not hybrids. Don't ask me why as they can both perform two different roles but the classes definition were pretty clear in Vanilla and only Shamans, Paladins and Druids were considered hybrids.
Hybrids were considered "Jack of all trades, master of none".
Shaman, paladins, druids could fulfill all three roles but not master them.
Warriors/Priests could only fulfill 2 roles.