I feel proponents of any programming language put a lot of spin around what isolated aspects it is good for, but fail to illustrate what a programmer in even one target domain gains from using it.
Are there programming language implementations unlike what is described above, that you feel back up their marketing?
Ditto for Smalltalk and Lisp.
Squeak Smalltalk and its evolutions, Pharo and Cuis, get talked up for being easy to program and re-program, but the closest to being a useful app is recent: the DrGeo rewrite. Others like Glamorous Toolkit and various proprietary developments with Cuis don’t lead to any useful outcome.
Lisp with its macrology is deified, but its most used variant, Elisp in Emacs, is confounding in terms of comprehending the runtime behaviour of features and in the debugging of what doesn’t work. Guile Scheme has so much written about it, but Guix is just about its only success.