UPDATE:
The main need for this being items that have special perks related to their set, Raid gear for example, they have those special mod slots, or many other sets have perks that boost rep from certain vendors, etc.
Sorry, I definitely failed to mention what prompted this, particularly since transmog exists and class items typically are all the same otherwise… thanks for the feedback.
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Any class item from before shadow keep was random actually but after shadow keep or armour 2.0 should be fine