You're overlooking the power that a preconfigured REPL with a persisted canvas integrated with markdown brings to the table.

It is a really powerful toolset, and building your own environment from separate parts is not trivial; so having it preconfigured in a standard way that others can reuse is no small matter.

I prefer online notebooks with a functional-reactive behaviour, such as ObservableHQ (which is JavaScript-based, rather than python); but Jupyter was the first popular one, so it hit hard.

https://mobile.twitter.com/observablehq/status/1234868724588...