I would refrain from comparing Haskell - a research language intended for academia and created in universities, to Go - a pragmatic industry language intended for production and created in a megacorp. Why would Haskell's tooling be better? It's not reasonable to expect that.
Google has produced a number of quite good tools. See also Bazel, for instance.
During my time there, I was genuinely impressed by the quality of many of the internal tools. E.g. it took GitHub code review tools a long time to get on par with Google's internal code review tools from 2015.
> Google has produced a number of quite good tools.
"Quite good" is exactly the wording that I would have used too. But Go's tooling is _really_ good; the language itself is, well, "quite good". And is still supported and actively developed!
