Here’s where this is today:
Golang 1.17 support was removed & backported. The reason it was marked a bad platform for go_1_17 was because golang pulled support for 10.12 which was EOL’d a few years ago. This comment on golang releases outlines the current deprecation schedule:
all: announce end of support for old macOS releases · Issue #23011 · golang/go · GitHub
And here’s where it was marked a bad platform, citing that “aarch64-darwin is 11.0.0 but x86_64-darwin is 10.12 .” Referring to the version of Apple SDK that stdenv in nix is built against-- more details in this thread), but it turns out stdenv isn’t required at all so go 1.17 was re-enabled a month later. So now golang 1.17 works in stable releases 21.11 and later.