I havent read the debates, but I have a funny feeling that server in this context refers to services and daemons, not an actual physical server. In other words, other processes running on the same machine as the kernel.
Care to post the debate? At least a link to the text? My thinking is that you dont normally want to share memory anyway, since it will just become corrupted and useless. Inter process communication is quite a science for exactly that reason, and the problem would become even worse over a network. Hence, nobody really wants two or more processes to share memory or address spaces, but they may want them to be able to pass information between them. That is a very different idea though.
Paul Atreides, Rand al'Thor and Luke Skywalker walk into a bar.
Sh*t gets serious.