Ah yes. Physics, the ultimate gatekeeper. If an idea doesn't work on the back of a napkin, it's done. Think about other approaches to the problem and get ano

Ah yes. Physics, the ultimate gatekeeper. If an idea doesn't work on the back of a napkin, it's done. Think about other approaches to the problem and get another napkin. I think that's what he's getting at. Analysis from first principles is hardly gatekeeping.