The prior point still stands if you compare the number of LISP modifications... basically every program with macros + interpreters + compilers... to the few things you&#x27;ve cited which were often a lot of work and hard to change. GCC particularly.<p>I agree the C crowd is more unified and that has huge impact. I&#x27;d go further to suggest that the legacy effect of UNIX and all the C libraries keep thing compatible. The C crowd is always sort of in maintenance mode for their language to keep everything working. While the LISP crowd rarely keeps anything and is often developing forms of the language. A subset are more practical with something long-term for real world use but most aren&#x27;t. This difference between C use cases and LISP is worth exploring in answering these questions.