Because too many people decide that selling online is easy and don't bother with dumb stuff like making clear pictures, spelling (Boler Hat/ china bowel), telling the customer what make and model the thing actually is (the part number is good enough right?), or what part it is ( Frabble used L@@K!!!!!), whether or not it works.
And remarkabley often the same "sellers" (should be "listers") have a No Refunds policy and will not ship to PO boxes because they copied someone else's ToS.
It makes the requirement for Item Specifics more reasonable when so many listings are missing basic information.
I blame Managed Payments.