Finance and insurance industries are full of Excel powerusers.
> LibreOffice is enough for the vast majority of use cases.
Often (from my job experience I can at least attest this for the finance and insurance sectors), Excel is an integrated part of many large workflows. Changing from Excel to LibreOffice would mean rewriting important parts of central business applications, so you better have a really good reason why you want to do the switch from Excel to LibreOffice.