All of those, plus having an interactive graphical environment, debugging experience and optimisation when needed.

Basically the ideas of Smalltalk and Lisp Machine variations, that are still only partially available in modern IDEs, and proudly ignored by the "vt100 rules and vi first" minded devs.

Yes!

Reminds me of the “Stop writing Dead Programs” talk. https://news.ycombinator.com/item?id=33270235