They are also very good at it. Coders suck at using excel. Honorable mention for the finance folks who know both excel and vba because they deal with both sides.
Really, spreadsheets are fine, they probably hit that sweet spot for easy to get something together and deep enough to express complex needs. But I have to admit, now that I have better tools I don't enjoy doing work in them anymore.
The reactive programming aspect is genuinely good; I wish my business logic could be expressed declaritively and the system just reacted automatically.
I also find it fascinating to consider the looks-like-a-spreadsheet-but-statically-typed-and-scoped world (airtable is a step in this direction, for example).