Why? Like, I might have weird taste, because I really liked generics and even Java-style checked exceptions :-) And to me, generics always sounded like the most practical way to do safe code-reuse across various types.
They add complexity which makes understanding and auditing code much harder. Look at OpenSSL and their overuse of macros, or heavily-templated C++ code.
No one is asking for C/C++ style macros, or even C++ templates. Go generics would be closer to Java or C# generics, which increase code clarity, reduce boilerplate and copy/paste code, and communicate intent.
