It's funny, I hear people talk and talk and talk about simplicity in programming, and see post after post about it on HN, and everybody seems to think it's a great idea, until it's staring them in the face.
I think the issue is that what Tcl people think of as simplicity is for most people an uncomfortably-radical minimalism.
It seems strange until you internalise the 12 rules, then it flows very naturally. There are none of the weird quirks you get in Ruby or Perl.
https://www.tcl.tk/man/tcl/TclCmd/Tcl.htm