That's pretty surprising to me. Have you never had to implement marshalers for unknown types and such? I have had to implement things like json.Marshal and json.Unmarshal for different encodings dozens of times in my Go tenure. I have had to use reflection a lot. I have had to deserialize into map[string]interface{} to handle ambiguous situations at runtime a lot. Have you never even had to wrap or build your own Printf equivalents that accept interface{}? No loggers? No custom containers? None of that which operates on unknown types?
I see use of interface{} all over the vast majority of Go projects. I think your experience may be atypical.
