Maybe. However your representation isn't without drawbacks either: All fields are typed by strings, and are thereby not strongly typed. And each additional level (in an array or object) requires mandatory boxing and allocations. The codegen variants on pure structs don't have this drawbacks.

I would say your representation is favorable when someone wants to work with arbitrary JSON in a flexible fashion. However if schemas and code generators are available, I would prefer to use those.

Thing is in Rust you can do both