Not only was I not asking rhetorically, but I saw the Gemini TNP and am aware that it never had an evaluated TCP/IP stack, only, as you said, the potential for someone to write one.

For about 4 months I was in charge of a Harris NightHawk running a B1 version of SVR3, which was two and a half pains in a half-pain glass.

I'm not an NT kernel fan, either.