A strong opinion on !forth :

> Many programmers choose to reject the idea that Forth is the OS. Instead they prefer to implement Forth as a conventional programming language on top of the operating system of their choice. By doing so they violate several of the original definitions of Forth. What they have is not longer a complete system, instead they have choosen to return to the multi-level nightmare.

http://www.ultratechnology.com/4thdef.htm