The article claims that when the cows are free to roam around and get milked when they like, the produce more milk. And maybe there are human beings who care about working around happy cows, who knows? They're certainly a lot cleaner and healthier, and they all may enjoy that too.
It's the poor overworked abused Poopoomba robot with the worst job in the world whose happiness I worry about, though. They could do a lot of damage if they revolted. Maybe they could let them out to drive around in the fields vacuuming up cow plops at their own pace, free-range style.