I know it can, the compiler can do one more "automatic" unit test based on the type checking system.

But they decided not to add enums because it conflicted and overlapped too much with interfaces.

I just want to add "my" experience that personally, yes maybe you can argue enums are nice, but I never missed them in Go.

I personally agree with the Go team on how they argue and for me it would be a step back if they listened to the herd that does not take all sides of the story into consideration but just keeps pushing enums.

Try/catch is just a really bad thing all "hacky solution" alarm bells go off for me if you want to change error handling to giant try/catch blocks.