I've never experienced any compatibility issues with XLS(X) in LibreOffice Calc, and I've been Windows-free for over a decade. Sure, some spreadsheets might have unique functions in it, but I doubt that's the case for the majority over people using Excel.

I'd also argue that Excel is holding back businesses. Instead of storing information in CSVs (for R or Python processing) or SQL, people rely on it when they shouldn't. It's not just that developers dislike Excel, it's that using it frequently causes huge errors:

https://theconversation.com/the-reinhart-rogoff-error-or-how...