Your argument isn't better. Humans eating something early on doesn't mean that it is therefore healthy for us. Something may have life sustaining nutrients but that doesn't mean it won't lead to disease or earlier death.
We look for cancers on PET scans by sending a sugar (Fluorodeoxyglucose) throughout the body for cancers to metabolize and light up on the imaging. It stands to reason (in my mind) that getting your nutrients from something not full of sugar/carbs (cancer food) is probably a smart choice.
So yeah, early humans probably at a lot of things, but we have something called science now that can allow us to optimize what we eat based on biological processes. So not live just long enough to reproduce and die.
