Well, I appreciate that perspective as long as the definition of science fiction doesn’t get so narrow that it has to fit within the scientific knowledge of a person with a bachelor’s in physics in 1975 - which it sometimes seems to.
My point is that it’s worth discussing early. That way the Sidebar can be clear, and the mods can do their thing and the rest of the members can avoid gatekeeping.
Personally, I can take or leave the wild science of Silver Age Superman comics, or Marvel. I’m not sure why anyone would consider that to be any more fantasy than Star Wars or Farscape however.