This is an interesting question and I’ve wondered it as well. Ethically, I can’t see why there would be a problem but I gather there may be a gross out factor for some. Certainly there are many vegetarians delighted by a realistic meat substitute but there are probably just as many that get grossed out by it. I was never one that was grossed out by it and was often amazed by the cleverness.
I would be interested to hear an ethical argument against the consumption of lab grown meat from an animal rights/welfare perspective. I must plead ignorance as to whether there are environmental consequences to lab grown meat.
