So the "killed gently and instantly" is the main one I think is wrong about these documentaries and the part that is certainly the easiest to construct a false narrative with. Largely IMO the horrors of industrialized animal husbandry are in the everyday life of the animal, e.g. feedlots, rather than slaughterhouses.

An example: there's this classic image you see all the time of the cow strung up by its hindquarters, kicking and flailing as it's moved along the assembly line. The problem is that this narrative is literally fraudulent. That cow is already dead, its brain has been destroyed by a bolt gun, and the reason it's "kicking" is because its 100% dead carcass is being shocked with electricity to induce rigor mortis. It's actually illegal to slaughter a cow any other way in a slaughterhouse.

For me at least the reason I hunt is because I love the personal connection I get to what I eat. Being responsible for my food is incredibly satisfying. Lab grown meat to me seems like the opposite of that.