Comment by TeMPOraL
Exactly. My related observation: half of the SaaS products I see would be more useful and ergonomic for the user if they were implemented as an Excel sheet.
(I actually worked for one of such "better off as an .xls file" startup in the past, and its main competitor was an incumbent that sold the same stuff as an Excel extension. Trying to replace that with a React app is not a worthwhile use of life.)
Algorithms are fine. I'll happily apply the most advanced ones I can get. The problem is with who applies them to what - as you and GP said, it's about user control - or, currently, lack of.
Excel is great until it you need to do something that takes up more space than a single screen. Then it isn't.
Sending sqlite databases to the users which they can interact with using both sql and a viewer is where it's at.