rms started a flamefest when he posted to comp.lang.tcl in 1994;
Why you should not use Tcl:
https://groups.google.com/forum/#!msg/comp.lang.tcl/7JXGt-Uxqag/3JBTj5I43yAJ

I don't like Tcl for its stringly typed nature but Tk seems like a nice light-weight GUI toolkit; but, unfortunately, it doesn't work with screen readers on any platform so you should avoid using it unless you're just developing something for your own use.