Fair enough, but I don’t think we can argue that Go had considerably less “legacy” during its modules transition than Python had during its various package mana

Fair enough, but I don’t think we can argue that Go had considerably less “legacy” during its modules transition than Python had during its various package management iterations. I think Go is just quite a lot simpler than Python (or Ruby for that matter) especially in how it distributes software (just source code, minimal dependencies on C, etc) which makes package management a lot easier.