Mmmm I'm puzzled. I don't think we are consulting the same community... Goroutines are everywhere in all the main go projects. Goroutines and channels are one of the main reasons Go exists.
"Readability reviews" at Google are somewhat notorious for imposing fairly arbitrary style choices extremely rigidly, for instance 80 characters per line (woe betide you if even one line in a 5000 line patch is 81 characters...). It doesn't sound so surprising to me that the people behind such a process might have decided that one of Go's primary selling points is 'confusing', given that the Go authors appear to believe their colleagues can't handle a brilliant language!
It's quite possible. After my experience with Go code reviews internally at Google, though, I am not eager to go back. I'd work on a project if I was paid to do it, but I wouldn't start one or advocate for it.
I'm pretty sure at Google they know why they created Go, why they're using Go, and so on...
The assumption that Google reviewers had something against goroutine puzzles me a bit.
Maybe the problem was not about goroutines, but about how they were used... I don't know, I'm guessing...