In my experience the start was the wide spread use of credit scoring.
It allowed for centralized interpretation of the conditions on the ground without the tacky need for having experienced people deployed, or so they thought. Now it is seizing up the credit system as the Bankers have broken the first law of Banking, which is "know your client".
I'm not a Banker anymore, but I have kept in touch with the "tribe" and the dumbing down of operations due to credit scoring is astounding in just 30 years.
Greed is all they have left, they can't actually think anymore.