After having the risks explained to them and having received our professional recommendation that they add application-specific logging that had no means of accidentally logging PII, one of our customers (a major bank) still insisted that we implement full HTTP body logging in a proxy.

Nobody is going to lose their job over this because the practical consequences are that you have to send out an "our bad" email and offer a credit protection voucher that most customers won't actually use. There are no costs.