I think I finally figured out why I hate drawing upside down and am not very good at it.
I know it's supposed to be a useful tool to learn to draw realistically, but it bores me. I don't get to see the beauty in the subject, I don't get to be invested in it, and so it just becomes a series of lines which is what drawing is, but I don't want to do it. I don't want to pay attention to the particular curve of a line if I can't see how that line is beautiful.
Maybe it's just an excuse. But it's the most I've been able to figure out.