I would like to interject here that "Service Top" has a bad reputation. I absolutely identify as a Service Top as a part of being a professional. I provide a service for a price, but that doesn't mean I "do as I am told" or lack boundaries. I truly enjoy being a part of a person's self discovery further into kink.

Categories can be interesting and useful as one cannot be all things at all times and there are different mind sets, but they can break down quickly if put under too much scrutiny. For the most part, I agree with your observations, but would be careful with them as a "hierarchy."