Scoffing and thinking "hasn't this guy heard of Jupyter" says more about your attitude than it does the tool or its README copy.
Hasn't this guy heard of [old product that is a huge pain and no one likes]? Why would he ever make something that suits his own interests and preferences?
Hasn't this guy heard of [old product that is a huge pain and no one likes]? Why would he ever make something that suits his own interests and preferences?