For context, here's the existing Map signature from the linked library:
func Map[A, B any](in <-chan Try[A], n int, f func(A) (B, error)) <-chan Try[B]
No, it was more of a general comment that once Go added support for generics, doing functional style programming starts to look as complex (or more actually) than languages that built support from the beginning.
Which part of the signature are you struggling with? Maybe I can help you understand.