Hola,
I’m a native Spanish speaker from Spain (I live in the U.S., spoke English all my life with a native English speaking father and my English could be better than my Spanish). Since I am Spanish, we use vosotros. While I heard people in the U.S. learn “ustedes comen”, I would say “vosotros coméis”.
Hmmm, probablemente tienes razón. Yo, personalmente, uso “vosotros” y “ustedes” pero depende de con quién esté hablando.