regarding this https://erights.medium.com/the-tragedy-of-the-common-lisp-why-large-languages-explode-4e83096239b9 to be fair, C++ is a large and complex language but it keeps growing. Also Java has new features, and/or more dialects like Kotlin.
Common Lisp can grow as libraries, DSL and macros (because it is an extensible language), but its specification is stable and immutable. It is a mature and usable language, without the needing to add other things.
@hayley ah, I found recently this #commonlisp DSL https://nikodemus.github.io/screamer/ and it supports both global compilation and interactive programming. It is doing many tricks: it redefines "defun"; it performs a code-walk on the entire loaded package; it maintains a data-structure at run-time with Screamer-compiled/managed functions and their dependencies, and so on.