I think you're being downvoted because your tone is a bit hostile, so I'll bump you up because I think you make a good point.

I love functional idioms as well, but you have to know the cost of those idioms in a non-functional language. The first thing I did when I had to learn go was determine if I could use functional idioms (map, fold, etc.) and did some research and testing and found that, no, functional idioms are a really bad idea in go. It just isn't meant to be used that way.

For the record, I had to learn go because the team I joined used it.