If Haskell didn't exist and had only been launched a few years ago alongside Go, what would the status of its tooling be today? That would be a fairer comparison.
Obviously one can't measure it objectively, but you do have a comparable case with Elixir, I believe. And it's clear that Go surpasses Elixir in traction.
So let's not discredit the merits of Go in such a long time. It definitely has more happening for it now than Haskell or Elixir.