Tell that to google sheets or google docs?? At some point you want to easily interoperate with a document or spreadsheet artifact. There aren't great drop in solutions while keeping everything within managed context. Compiling to and from docx or xls files don't make sense. It makes the most sense to spin up your own. What do you expect them to do instead?

I've seen large enterprise customers who adopt GSuite but still have a few thousand Excel licenses because the people who need certain Excel features, just need them. Average user might find Claude Sheets is enough, but it won't replace Excel everywhere anytime soon.

I've not really seen anyone using sheets for serious number crunching tbh. It does cover 90% of use cases though.