[update]

Opening paragraphs: "When building products you should measure your progress by the assumptions you’ve managed to test, and not by how many lines of code you’ve written.

In some cases — if it’s possible to validate the idea using existing tools — writing code might actually slow you down, and should be avoided."

Worth reading if only for that. I could write an essay on why sitting around & thinking can be far more productive when it comes to coding, rather than -actually- coding.