Keeping as constant Go's opinionated (for better/worse) management philosophy, I don't think there's anything the Go team can say to put this criticism to bed. It's simple: Rails can be "omakase" because Basecamp is a tiny company, and Go can't be (without gripes) because Google is a big company. Hell, it wasn't even clear a few weeks ago whether Clojure was allowed to gripe-free "omakase" status, and hardly anyone on HN has even heard of Rich Hickey's company.
Since, short of drastically changing how the project is managed --- something I don't think many Go users have an appetite for --- there's nothing they can do rhetorically to shut the argument down, I think it's best ignored.
If you don't want to use a project affiliated with Google, don't code in Go. Similarly, if you want to have large solo impact on core features of a language platform, like package management, set your sites somewhere other than Go, where fairly intensive gatekeeping to that kind of stuff is widely considered a feature, not a bug.