Why is soy milk any more confusing than peanut butter?
I agree with the actual point you're making — though I can imagine a DnD-style alignment chart with one axis for substance purity and the other for functional equivalence, such a chart has both soy milk and peanut butter in the "functional purity, ingredient rebel" corner.
https://www.tastingtable.com/893109/the-unique-history-behin...