There are two additional “bonus features” for coconut milk, to add to its sustainability “score”:
1) Coconut trees can grow in tropical beach and marsh areas where some of their water need is supplied by seawater or brackish water, so they aren’t fully competing for fresh water resources.
2) After squeezing the milk out of shredded coconut “meat”, the meat is used in other food products for people (coconut flakes, coconut flour, etc..). especially where it is processed in small batches in places like Thailand and Indonesia. I doubt there is much edible byproduct from oats or soybeans after making oat milk or soy milk…. Those byproducts probably go to plant mulch, compost, or dog food.

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