[ts4z]

Go has good (enough) built-in arrays and maps. But if you want a tree, without generics, you're really limited. With generics, you can get a nice containerized type, but you don't get the nicer syntax that the builtins have.

It's not just types, either. Look at the signature for the built-in sort, which is amazingly cumbersome to use. A generic wrapper around it hides all the ugly.