Yeah, we do try to maintain at least some back compat. Some things go through a deprecate-and-drop cycle, but that is more often driven by "the old thing is a p

Yeah, we do try to maintain at least some back compat. Some things go through a deprecate-and-drop cycle, but that is more often driven by "the old thing is a pain to maintain internally" than by "the new thing is more user friendly". New top level command line options are rare these days, and magic "do what I mean" options also rare: we tend to prefer "tell us specifically what you want".