I think I can summarize hedonomics right here: Most people spend too much time optimizing for the acquisition of more objects and not enough optimizing their use of objects they already have (where objects can be anything we want not just physical items).

ex: "If only I was better looking!"

economics: acquire more of the properties that make you attractive to other people

hedonomics: are you maximizing your looks given your current resources?

I think the distinction relies on a naive understanding of economics, but it is nonetheless a good heuristic in general to ask that sort of question.