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Even the racket teachpack libraries designed for education are very capable; I was able to make this structured editor with only using teachpack content without external deps: https://github.com/disconcision/fructure
https://github.com/greensoftwarelab/Energy-Languages/issues/...
Racket internalizes Extra-linguistic mechanisms https://felleisen.org/matthias/manifesto/sec_intern.html
Also the fact that various DSLs can inter-op with each other directly, so that you can use something like a binary parser description, as if it was just another Racket library. For example this description of the format https://github.com/Bogdanp/racket-binfmt/blob/master/binfmt-..., is directly included in another file as a regular library https://github.com/Bogdanp/racket-binfmt/blob/master/binfmt-...
I agree that startup time is not a winning aspect of Racket. My naive understanding is because Racket is not a direct bytecode interpreter like CPython, but actually has to run a compile step to native code, and doing that for programs + their required libraries necessarily takes at least a couple of hundred milliseconds even before anything can start running, while CPython can pretty much start executing from the get go.
Common Lisp has many industrial uses though.
(https://github.com/azzamsa/awesome-lisp-companies/
https://lisp-lang.org/success/
http://www.lispworks.com/success-stories/index.html
such as
https://www.cs.utexas.edu/users/moore/acl2/ (theorem prover used by big corp©)
https://allegrograph.com/press_room/barefoot-networks-uses-f... (Intel programmable chip)
quantum compilers https://news.ycombinator.com/item?id=32741928
etc, etc, etc)
Looks like you're already in Emacs. I strongly recommend racket-mode as mentioned in another thread.
With regard to prototyping GUI's I'd suggest taking a look at https://github.com/mfelleisen/7GUI. https://github.com/Bogdanp/racket-gui-easy could also be a good place to start.
With regard to Racket more generally, I'm probably not the best person to ask since I had a very high friction start where I just banged my head against the wall until things made sense.
Looks like you're already in Emacs. I strongly recommend racket-mode as mentioned in another thread.
With regard to prototyping GUI's I'd suggest taking a look at https://github.com/mfelleisen/7GUI. https://github.com/Bogdanp/racket-gui-easy could also be a good place to start.
With regard to Racket more generally, I'm probably not the best person to ask since I had a very high friction start where I just banged my head against the wall until things made sense.