I've said this many times.
I accept human nature for what it is, so that's why I think we should base our expectations for people on what we think most of them will do all the time or almost all the time. Not base our
minimum expectations for people on what we think people should do if only "we are better than that".
Take USPAP as an example. Based on my direct exposure to thousands of appraisers in QE and CE settings over many years I believe most appraisers want to do right by their assignments. That includes meeting the actual SR1/SR2 expectations the users operate under. I don't think there are very many outlaws among the appraisers, actively conspiring to lie to their users.
I expect brokers to act like brokers
I expect lenders to act like lenders
I expect borrowers to act like borrowers
I expect appraisers to act like appraisers.
What I don't expect is for any of the non-appraisers to act like appraisers. That becomes the unrealistic expectation. Not because we're any better than anyone else but because the roles are different. An RE broker who acts like an appraiser is probably not doing right by their client because their job is to advocate and do the most they can in advocacy for their client's interests. Not sit back and call balls and strikes regardless of the outcome.