I'm surprised to see that that's actually a thing people write about. I'm afraid I can't answer your question right now, as I have no idea why anyone would do t

I'm surprised to see that that's actually a thing people write about. I'm afraid I can't answer your question right now, as I have no idea why anyone would do that (as opposed to, say, vector-valued rewards---i.e., why is the ability to complex-multiply two complex rewards relevant, as opposed to merely comparing separate components of rewards from R^2). I'll have to read up on the subject :)