We invented alternatives, definitely. But there are still plenty of trade-offs. Much lower in calories and saturated fats, for instance.

If you're trying to fatten up a skinny little baby (as I'm currently working on, having placed with a toddler a few months back) the pediatrician is going to stare daggers at you if you say you've been giving the kid oat milk rather than whole milk. Literally had this conversation already and got hit in the head with a stack of literature just for asking.