Not intensive farming is less bad than intensive farming but in your example, a cow still needs to have a calf and that calf slaughtered for milk to keep coming. And that cow will be killed off the moment it stops making enough milk which is a fraction of its natural life span. It’s not like not intensive farming is innocent either.

And for shit and giggles, check what’s the proportion of industrially farmed meat vs non intensive that’s sold every day.