* flexibility (throw data anywhere and link it to each other, make edits, write notes),
* power (formulas, etc), and
* familiarity (the most underrated factor) of spreadsheets.
Nothing else allows the non-tech user to feel empowered like spreadsheets do.
Spreadsheet evolution has been slow though. Google Sheets added cloud + collaboration 10 years ago. We (https://coefficient.io) are adding the layer of connectivity to sheets so they can remain in sync with the actual sources of data (Cloud apps like Salesforce, DBs, BI tools, etc) so sheets actually become "live" (even though they have been in the cloud for a while) and to reduce manual work and increase trust/accuracy. There is so much more that can be done to leverage this largest software platform that is out there.