One of the big benefits of clojure being dynamic is that everything is data (e.g. a map, set, vector or list).

This is what allows reuse.

- The vast core library of functions that manipulate those data structures can be used for everything in your program, cos it's all data.

- Most clojure libraries take and/or return data, reducing the need for clumsy adaptors, or even worse not being able to get at the data you need cos the library writer was really enthusiastic about encapsulation of everything they thought was of no use to consumers.

- You don't have a person class, you have a map with a first name and last name. Now the function that turns first + last name into full name can be reused for any other map with the same keys. (A rather spurious example, but a real one would take a large codebase and an essay to describe)

I can only recommend watching some of Rich Hickey's talks, particularly these ones, they're not entirely about types, but they express the above ideas much better than I can:

- Simple made easy https://www.infoq.com/presentations/Simple-Made-Easy

- Effective programs https://www.youtube.com/watch?v=2V1FtfBDsLU

- Are we there yet? (this one is more about OOP, but unless you're using something like haskell, idris etc its relevant for your type system of choice) https://www.infoq.com/presentations/Are-We-There-Yet-Rich-Hi...