My side is that I worked for a bank on the brokerage side for ten years in different positions. What always struck me was that my access was very carefully controlled, I was a background checked employee and had to meet with compliance once a year, etc etc.
However when a law firm asked for anything or consultants said they needed more data they just sent massive data dumps to the network admin guy, no questions further asked. At least not at my pay grade.
As I've consulted I ask for only what I need to keep my own risk down but it is always a surprise to my clients I don't want PII I don't need and only the data that my model will help enhance.