Do you know anyone where this has been the case?
Yes, I know people who raise chickens for dual purpose. There are entire breeds of chickens that are dedicated to dual production.
* gestures to most of recorded history *
Before the industrial revolution, 80% of us worked the land, most familiar with animal agriculture.
This is irrelevant. Do you bring up that before the industrial revolution that grown men used to marry children when people talk about modern views on grooming?
Did you miss the context? The other user questions whether people have ever been unperturbed by slaughter when raising animals. It's a strange sentiment when you consider that historically we have been much, much closer to the animals we consume and intimately familiar with the process of how they get to the table.