Most people forget that *nix is a professional operating system while Windows is geared toward amateurs. That's why amateurs do not like *nix cause Windows is geared toward them for ease of use but this ease of use limits flexibility.
*nix is very diverse. Your statement is true for:
Solaris, AIX, and other server oriented Unix variants
Most of the BSDs apart from the two mentioned below
Linux distros such as Gentoo, Slackware, etc.
It is not true for:
MacOS (which has a good claim to be more of a real Unix than Linux)
Linux distros such as Ubuntu, Mandriva, Mepis etc.
Possibly other things such as PC-BSD and Nexenta: I do not really know because I have not used them.