We have 15 equipment slots available: head, shoulder, chest, back, wrist, hands, legs, feet, neck, main hand, off hand, relic, trinket x2, finger x2.
The highlighted ones are equipment slots that we share with other classes/players (ex. tier, healing wep etc.). That leaves us with two equipment slots for drop. I think Blizzard can survive without a need to invest too much time into it, since 13 of the equipment slots we have are also useable by others.