[Retra]

There is no position from the perspective of beings that don't exist, let alone a neutral one. It's always the beings that exist that make decisions, and it's always their perspective that counts.

Really, it doesn't matter if an animal that doesn't exist would 'prefer' to exist in suffering, because that's a purely counter-factual fantasy to begin with. All that matters is whether we should prefer such an animal to exist. Anyone who prefers they wouldn't based on vague moral arguments has to reconcile that with the fact that killing those animals for food is right in line with correcting the 'error' of their birth.

A better way to make the argument is to appeal to things we do actually care about in an ethically consistent manner: how inefficient and wasteful it is to raise animals for food. If you have something that is more efficient, tastes better, and is healthier, then it becomes harder to justify that waste, regardless of anyone's moral position on suffering. Anything else is just an reasonless appeal to emotion.