* a teaching language
* a research tool
* an application programming language
Lisp has been already in times when the technology you are using today was still under invention. Lisp existed before Smalltalk, C, C++, Java, ... thus often technology was developed in an unstable surrounding where inventions are just being made. Lisp also had to keep track of the changing IT landscape. During the 70s people were using DEC PDP computers.
Thus you find evidence for everything.
There are well-documented stable, nicely reusable, code bases in Lisp.
Clojure is most of the time married to a small eco-system: Java/JVM.
Lisp has seen and supported many more eco-systems and will see even more in the future.