Earlier quoted context omitted.
For legacy spreadsheets, you're 100% correct. I'll need to keep a version of Excel around forever. If they price me out of 365 by making me pay for Copilot shit I don't use or want, a perpetual license to Office 2019 runs about $20 and will do that job for me. For new work that I might have otherwise done in Excel, there are good options. Collabora works. Libre Office works. Google sheets works. And Grist is quite go…
None of the things you listed are suitable replacements for Excel. None. It has nothing to do with existing files/compatibility. Excel is unparalleled.
This is not theoretical; I learned it by needing to get shit done in a context where having an activated copy of Excel wasn't practical. Excel was paralleled and in one case surpassed.