I would guess if they can handle real actual meat, they can handle fat and nutrients which would seemingly be the easy part. If not would it be any different than today's vegetarians which just take supplements?
> letting a cow loose in a pasture to do what it does.
Are most cows pasture raised? I think most are raised on feed farms; I think antibiotics and hormones play a role in at least some, but perhaps most? They also emit C02 which we'll eventually have to pay for. And more generally animal farming is a (the?) primary source of new diseases already. I wouldn't expect "lab" grown meat to do any worse there, but perhaps better. Still, it is something new and new always carries some risk. But
> The 20th century was marked by morally-unmoored technocrats allowed to run wild; why is the 21st century doubling down on this?
It was also marked by dramatic increases in quality and quantity of life.