I miss the simplicity of how I remember XFree86 running on the alt-f7 terminal, and having alt-f1 through alt-f6 for my own needs... a second X on alt-f8 when I got 64MB of ram. ctrl-alt-backspace to quickly kill X and restart it (within a few seconds on a 486).

Then, gradually, these things disappeared from Linux, for no good reason; you can still configure them but someone decided in their infinite wisdom that some of the most compelling features just weren't really needed anymore, in favour of rewriting the XDM again and again until now there's too many of them and none of them are really any better than what we had in the 90s.