It's true that those are library changes, but I think when the parent post asked "Has updating the Go compiler actually been an issue for you in the past", they

It's true that those are library changes, but I think when the parent post asked "Has updating the Go compiler actually been an issue for you in the past", they meant "updating the Go distribution", not just compiler, since those two things have been conflated. And in a sense, yes updating the go compiler was an issue with those because updating the go compiler forcibly updates net/http, with no option to not tie those exactly.