Go is poorly designed.

It has a mediocre type system, bad support for genericism, too much reliance on non-extensible language keywords (range, make, etc.). Want to range over a tree? Too bad. Or maybe wrap the tree with a chan and watch performance and simplicity go out the window.

I mean, come on, what modern language actually recommends casting to the top type? That would be like if idiomatic C++ involved casting things to void*, or if idiomatic java involved casting things to Object, just so you can write generic functions and types.