25 years of programming experience here. I have written my own Lisp runtimes, micro kernels, C compilers, high performance web servers, a million selling game w

25 years of programming experience here. I have written my own Lisp runtimes, micro kernels, C compilers, high performance web servers, a million selling game written in C, high performance pairing/rostering optimisers for the airline industry etc. I am a language geek and have programmed in pretty much everything I could get my hands on. And are currently maintaining a high performance compiler for a Haskell style language, and have fun learning how to prove code correct using Coq/F*/Idris/Lean. Is that mature enough for you? I would have zero problem writing applications in Lisp. But I choose not to. Why? Because I am more productive in other languages. That might not be the case for you. However your N=1 experiment doesn’t in any way generalise to N=everybody else.