Yes and no. The core point is that business rules should be encoded as functions, not in the type system. Everything ending up a map is a side-effect of that si

Yes and no. The core point is that business rules should be encoded as functions, not in the type system. Everything ending up a map is a side-effect of that since the functions need somewhere to store the information. But a map is also just one solution. You could use a fat struct as well, or implement a ad-hoc relational database (like what entity component systems really are)