I agree, I think it's a natural successor to a spreadsheet for something more complex. You can even have a section with tabular data (i.e. an embedded spreadsheet), which is what spreadsheets excel at, but it meshes very well with the classical programming paradigm.
Jupyter notebook is a regression from Excel, at least Excel computes the dependencies between the cells. With Jupyter, you have to be careful in the order you evaluate the cells.
And both falls on the floor the minute you want to use a spreadsheet/notebook as a library of functions, i.e it's not composable.
