Earlier quoted context omitted.
You just discovered repl driven development that lisp users have been advocating for years. Check it out in Clojure: https://vvvvalvalval.github.io/posts/what-makes-a-good-repl....
Well, python has had repl driven development for years too, notebooks only change the tooling around that if I’m not wrong.
Furthermore, the marriage of application framework / application model wrappers with industry-leading data science tools sounds particularly special, and orthogonal to the presence of a repl.