Demanding does not necessarily mean power
You seem to be confusing demanding users with power users. While some power users are demanding, many non-power users are also demanding. In particular, a (good) software developer may need a more powerful machine for some specialized work they are doing, but needs very little IT support since they know how to resolve most issues themselves. At the other end of the spectrum are the technical illiterate who, no matter how basic and managed their computer, still call help desk all too often.
There is a reason for the stereotype of the "is you computer plugged in" service call.
I was with you while you were discussing whether power users really do need more powerful kit, but you then lost me when you jumped to a chart about demanding users, as if they were the same thing.