Cooking seems to be orthogonal to the discussion of species classification.
I agree with your point but it is moot for current day. To a degree, there is a case to be made about reviewing how we classify humans as a species. Human beings have long exceeded the biological limitations imposed by evolution.
People are feeding cats synthetic plant based diets now, but we still classify cats as obligate carnivores based on their natural diet in their natural environment.
That is surprising by a good number of reasons. Thankfully, we've learned how to synthesize taurine but regardless I can't fathom how the critters can absorb protein and other nutrients from plant matter.
Hurray for science, I say.