Generally agents steer well clean of that, for legal and time reasons.
A realtor is there to put properties in front of you / put your properties in front of others, and then close the deal when you tell them which property you're interested in.
Volume pays realtors, not price-over/under-replacement.
There are other details that come up through a transaction that many people wouldn't even think about. Are appliances included? Window treatments? Leftover paint? What year the transaction closes could impact taxes or incentives for either party. Inspections (what types of inspections are permitted, their timeline, what will be repaired prior to sale).
If there are disagreements about any of those, or if the property was materially misrepresented by the selling agent, it's way more messy than if another agent is involved and it's clear who represents who.
Your realtor (as the seller) is now going to give preferential treatment to one buyer for their own personal gain.
So they're only preferring whoever is bitching the loudest?
If people are out there just doing what their agents say with no questions asked, well, then yeah probably insist your agent doesn’t represent the other party too.
This is a blatant conflict of interest. My god.