> our agent knew what was a fair price, what we’d likely be able to push the sellers down to, advised us through the whole process.

I've seen cases where the sales agent knew the seller's minimum and basically told that to the buyer. They didn't negotiate on the seller's behalf so much as negotiate to get the deal done quicker.

I'm sure the buyer's agent looked good to the buyer. This scenario and the one you describe are almost indistinguishable, depending on which party you are.