Stick with the e-commerce use case. In person payments are one thing. Obviously, cash is an anonymous system, and that works fine for in-person retail payments. But go back to the diamond ring example. How do you safely buy something like that anonymously, without extreme risk of rugpulls in the form of non-delivery of goods or services?
Discussion
A bills of lading model is the best I’ve been able to come up with for this problem. Know third party carriers facilitating the anonymous transactions for a fee.