Another great use case is piping database output (e.g. psql) directly to HTML. HTML tables can be opened in a browser or directly in Excel. So all you need for a complete BI tool is a database and the command line.
Long time React user here, have started experimenting with hooks. My general sense is the useState hook is a pretty neat idea, but useEffect and friends need some work. Definitely doesn't have that same "completely makes sense, this is a great API" feel that I typically associate with React.