Gonuts is full of content that they were not keen in generics, in fact gccgo has been abandoned, and I expect it to eventually follow gcj and be removed from GCC.
Go culture is not welcoming to experts contributions, Rust, D, C#, Swift and others, heck even Java, are more open arms to language designers.
Nobody is keen about language features. Each new one adds complexity. That isn't the same as failing to recognize a need, though. And we know the Go team recognized the need as they clearly kept working on generics all the way from the very beginnings up until the Haskell muscle showed up. The receipts are there. The results just weren't good, as one would expect from a team who weren't shy to say that they didn't have the expertise necessary.
You'd think one of the HN experts would have shown up to offer that expertise, but I guess there was a lot of "go doesn't have generics lol" needing to get out.
Some did try, and were welcomed with stones, clubs and pitchforks, until leadership had to reach out for help, from the same team that designed Java generics, years before Go v1.0 came to materialise.
The Haskell muscle had proven their skills already with Featherweight Java, in 2006.