Comment by NateDad

You assume that Go's simplicity means you end up copying and pasting a lot of code. This is just not the case. In juju (https://github.com/juju/juju), a ~300kloc project, we have approximately one single type that we've copy & pasted where a generic implementation would have been better (it's a set). And honestly, implementing full set functionality was not even really necessary, someone just felt like doing it.