You’re right.
My daughter is very into Paleo and I’ve never once heard her attribute the diet to ancient wisdom or any crap like that. They look at what foods were available - in season - and understand that this is what human’s evolved to eat. The jump into agriculture was much too alien and fast for the human body to adapt to properly.
Yes. Early humans were opportunistic. And that meant that they didn’t have access to white flour or refined sugar. We’re still opportunistic eaters, which is why we’ll dig into cake if it’s sitting on the counter.
Bingo!