In my experience, hilly rides are just harder and I'm more tired after them. It's actually very surprising that what I would expect to be a common sense viewpoint is being considered the contrarian one! Sure, apply elementary physics and hills are meaningless, but apply real-world physics and maybe they aren't so meaningless. And we aren't even considering the differences in energy efficiency when your body has to work harder, or the major differences in energy loss through air drag at high speeds. There are also concerns about how comfortably and efficiently you are able to convert muscle energy into motion through pedaling (similar to how fast walking gaits are very inefficient) at both the high (downhill) and low ends (uphill) of pedal RPM.
The big hills I can think of near me all have either stop signs at the bottom, or another hill to climb.
This sort of edge case maximalism feels useless and needlessly contrarian - it seems as though if I were to claim you can pay for things by credit card, you’d claim “that doesn’t work what if the power is out”.