> A bunch of pioneer project like docker, kubernetes, etcd, prometheus etc. has been built with go and I don't believe that the maintainers suffered lack of generics and error handlers.

Here's an experience report from k8s: https://medium.com/@arschles/go-experience-report-generics-i...

They've been using a code generator as a work around: https://github.com/google/gvisor/tree/master/tools/go_generi...