You make really good points. But I’m going to call out this point…

But because Starbucks currently offers non-dairy milk, those options are subject to the ADA, specifically:

Oat milk is not milk. It’s a completely different product made from grain, not mammals. If I’m lactose intolerant at a bar can I request vodka? It has about as much relation to cow’s milk as oat milk. In fact, I think vodka arguably closer to oat milk than cow’s milk. The only reasonable one for one replacement for cows milk is lactase treated cow’s milk. Anything else is not comparable.

Or, what if Starbucks stocked lactase treated goat’s milk. Is that a substitute for cow’s milk? It’s much more similar to cow’s milk than oat milk.