People don’t need a lot of things. However certain foods, like animal products including milk, lead to optimal health. That’s how the Dutch got so tall. So you can drink your diluted nut or grain water. I’ll stick with bioavailable nutrients from animal foods.

"A lot of the world is able to walk, so people don't need wheel chair access in buildings". "A lot of the world is male/female, so people don't need made up genders and surgery". ... sounds great, huh?

Anyway, where does this "people don't need X" stop, though? You also don't need oat milk, tofu, soy, peas, etc. to survive.

Let's just go back to foraging for roots and berries and see what population size we can sustain!