Why isn't this under the "Supporting Vendor Feedback" section?
FTR, I would consider it to be a significant difference to buy/sell something as a swap compared to a Motor, ECU & Harness. It ultimately comes down to communication, but both parties share responsibility to ensure that they know what they are buying/selling.
If it was propositioned as Motor, ECU and Harness I think there is no right to expect power steering pump and other accessories to the motor. But that should be made clear to both buyer and seller before the deal is put into action.
I would consider this as a learning experience for both as they have both suffered from the transaction as a result of unclear communication.
(My communications with BimmerBoys has been prompt and honest, but I have not yet made any purchases)