Hunting/gathering societies, much like predator/prey relationships, are intrinsically more sustainable. It’s pretty much the only system of checks and balances on population growth.

I don’t think you can handwave away natural selection under appeal to nature fallacy. That’s usually reserved for medicine. The only place it’s really applied in agriculture is organic/non-GMO produce which is a whole other shovel of BS.

And in point 5, if not for factory farming, our consumption of beef is not sustainable as it is. There is, quite simply, not enough arable grazing land in the world to accommodate our consumption of beef. The only solutions to that are to reduce the level of beef consumption, or to expand factory farming. And any institutional/government-level intervention to do the former would be wildly unpopular without there first being a sizable voting population who reduced or eliminated beef consumption themselves.