> I think something like when a variable type in an enum was an interface it would destroy the galaxy or something,

Hah :-)

> Here you Go: https://go.dev/doc/faq#variant_types

Not quite the same: Variants are a constrained list of types. Enums are a constrained list of values.

Let's assume that I agree with the reasoning for not having a constrained list of types.

It still doesn't tell me why we can't have a constrained list of values.