I don't fully understand the differences of meta, location, and systemdef, in terms of how they should be used.

systemdef expects TMY meta to be used in its first parameter. But what if I want to use the lat/long for my plant, not the TMY station? What if I am looking at operating data (which I am), and have no need to pull in a TMY file?

Why doesn't systemdef use a location instead of a TMY meta as its first parameter? (Why isn't a TMY meta a Location object?)