Comment by silisili

Agreed. The post should be titled 'Go enables TCP_NODELAY by default', and a body may or may not even be needed. It's documented, even https://pkg.go.dev/net#TCPConn.SetNoDelay

To know why would be interesting, I guess. But you should be buffering writes anyways in most cases. And if you refuse to do that, just turn it back off on the socket. This is on the code author.