"This duty obligates a real estate broker to act at all times solely in the best interests of his principal to the exclusion of all other interests, including the broker’s own self-interest." https://www.nar.realtor/sites/default/files/handouts-and-bro...
Good luck proving that the real estate agent just didn’t know about the house they didn’t show you.
"Agents who represent clients under single agency owe a fiduciary responsibility to the client" https://www.thebalance.com/agency-relationships-in-real-esta...
But do you have an example of that fiduciary responsibility being enforced to any real degree?
In such a situation the embedded interests (agents) may well be antagonistic to change, but it doesn't mean that change isn't globally a good idea....
Edit: oops meant buyers agent - corrected.