You made me smile with that line on the humans looking around and thinking in different ways to eat the landscape.

You are correct, our ancestors ate whenever and whatever they could but we are not our ancestors. We’ve developed and went above and beyond those constraints.

And this is not to deny your point. I can easily withstand an entire day with a single meal, like many others, but it is not pleasant. And it is very well understood how keeping a schedule for eating, properly, is benefitial.