Well, while I can somewhat agree with your point; it sounds like you are looking at it from a business standpoint. Someone who will be working with the details of the code is going to appreciate unit tests, not only because it verifies all the tiny pieces of code the person wrote. But also because it makes it very easy to track down where issues might be if a feature is broken.
I dont agree with the "100% test coverage" mentality, but I think there is value with unit and integration tests.
I wrote a mini guide to Go microservices a while back, maybe someone here would find it useful :) Just recently found this community so I'm hoping it fits here!