I'll be honest and admit that I have barely used a Notebook, but I can see they have their place. They are very popular with scientists, where they are writing

I'll be honest and admit that I have barely used a Notebook, but I can see they have their place. They are very popular with scientists, where they are writing experimental code, much of which will be thrown away. For stuff that needs to be used in production then they seem like the wrong tool. I had actually thought that they would be great for learning until I read this. (I am a bit disappointed that the presentation doens't actually explain the reason for out of sequence execution, which seems to be one of the central complaints).