This is true BUT data is easy to refactor and Clojure is really about Data. Clojure's big picture is a principled mental framework for reasoning about data, and

This is true BUT data is easy to refactor and Clojure is really about Data. Clojure's big picture is a principled mental framework for reasoning about data, and as such gives us the core vocabulary and utilities we need to write programs that operate on data in a principled way (immutable data structures, immutable database etc). So Clojure IMO is today in this awkward spot of saying "Here, use these new principles of data to go solve problems in this new better way!" but nobody has really deeply figured out what that even means. The whole middle ecosystem layer has yet to be written. But it's happening, there's a movement of believers coordinated by Rich's talks and working to this common goal. And when it works, the whole 100k+ loc system that can't be changed will be but a memory. (I am Hyperfiddle co-founder, Hyperfiddle poses the question: is it possible to express sophisticated database applications out of just data? We think we've made enough progress to show that the answer is probably yes. Hyperfiddle apps are not stored in git but rather in Datomic. And for special cases where you do need custom code, you can just drop down a layer seamlessly into Clojure.)