Stuff like this is so silly. I understand having rules around how things are named, nobody wants to be misled about what they're buying. But were cow juice enthusiasts really getting tricked into buying soy juice? Do we have to specify the animal? Can I sell rat milk as 'milk' and they'd be ok? What's the difference between that and oat milk? So long as the origin of the milk is clear I really don't see the issue.
Obviously I know it's just dairy industry deep pockets doing what they can to remain #1 but it's just so silly.