Looks like it solves a common problem but the page is a bit confusing. It could make it clearer upfront what it does (I didn't know what reactive meant in this context) and how it relates to Jupyter (I thought it was official/core stuff at first, but I take it its a third party tool that integrates into jupyter).
Stuff like "Trust me? Good." in the introduction doesn't really help me answer "wtf does this do" more quickly and the first intro sentence is pretty long and convoluted.
On the other hand, the link description alone was enough to convince me that this is something I want.
Having a very specific target makes it easier to reach that target in writing, I guess, and harder for people outside the target to understand what it's about.
Well, other than Observable, reactive notebooks are not that common and well known (precisely because Jupyter, which is the most famous, didn't support that model before).
So maybe today is the first day that you are exposed to that model and you learn about it? There's always a first time.
Reactive notebooks are what change the workflow from command line-like to spreadsheet-like.
It may not matter much of you use the notebook as a glorified terminal, but it is a godsend if your workflow involves data analysis with heavy dependencies between filtered subsets.
Stuff like "Trust me? Good." in the introduction doesn't really help me answer "wtf does this do" more quickly and the first intro sentence is pretty long and convoluted.