Real estate agents depend on referrals. If I hire a buyer’s broker, I’d tell them I expect to be informed of any issues that would affect the value of the house that they know about or should know about. If a law that affects my purchase is likely to be passed, I want to know about it. I want my broker to look out for me as they would themselves. If they don’t, they won’t get a good referral out of me and I might sue.