Well don’t you need a bunch of humans to test your persuasion capabilities? How would you run improvement tests in a loop??

You’d launch something like ChatGPT and get millions of people to use it everyday.

What is the measurement? I don't think most people come back to a conversation and say "gee you really convinced me to do X, here's the proof that I did it" and even if they did that data would still be very messy and require verification.