The reason scope creep has gone so far is because of preserving interpersonal relationships (imo)
This is my take, but I've noticed this in myself but in friends and others. But when you are MD is dating a NP/PA and they sort of believe in this hogwash or know people that do you sort of have to moderate a little bit to preserve interpersonal but also working relationships. Also lot of these nurses seem to really believe in nursing theory and believe in their modality of caring or whatever that is an alternative fact/truth to like medical care. Its like an entire ecosystem I feel like you can see when you see all these textbooks written by DNP/NPs or whatever that advocate strongly for the nursing part or whatever. Just spitballing my thoughts, curious what others think