I sometimes make the joke with my business friends "What type of Office suite are you?". Because all their jobs basically come down to Excel, Word and PowerPoint, or a combination of all three.
Those tools are still used big time in the business world (which is magnificently bigger than this community).
It's not just the tools that are used. As Microsoft (and OpenOffice folks) understood in the 90's, it's all about file formats.
On one hand, you have things like CSV which Excel understands but doesn't prefer... easily generatable from a database or flat-file even using comamnd line cut/sed/awk.
On the other hand you have XLS(X) - which a TON of enterprise software generates - because it works better on Excel (lockin!) and supports things CSV doesn't (multi-sheet files, formatting, even pivot tables and such).
To win or even compete in this space you need to support the file formats - Apple's Numbers supports XLSX, but the feature support is minimal and lots of edge-conditions that are not present when using Excel crop up here (as with Libre/OpenOffice).
Those tools are still used big time in the business world (which is magnificently bigger than this community).