I think your sarcasm detector has gone missing chief.

"Systems program" or "systems programming" is a meaningless term because people use it differently. Discussing what it means is a waste of time. It is better to be specific.

Um, there is user-level implementation of TCP/IPv4+IPv6 stack in Go [0], developed and used by Google as part of its gVisor.

[0] https://github.com/google/netstack