Excel alternatives might be uncountable. Implementing spreadsheet basics is an advanced beginner exercise. But even Google’s billions only get it a distant second best because Microsoft is still working hard despite the lead. Sure Google and Apple can meet most needs most of the time. They’re good enough mainly because they are free beer. Not because they are open source. Obviously. Don’t get me wrong. I’m a GNU fanb…
I'm not an Excel user. Genuinely curious: Is it really that the alternatives are worse, lacking features, unstable, or does it come down to "they're not Excel", in that they're not a drop in replacement that can perfectly load and run every Excel sheet ever created. Because that would be my gut feeling: Not interoperable enough, since some things just work differently, but not necessarily much worse. If you can't sen…
But the barrier to someone using it is much less because it is gentler than, say, giving someone python code to do the estimate and expecting them to do it correctly. I think the interface familiarity is key.
Unfortunately, while LibreOffice is usually pretty good at all this, it's always just one or two peculiar difference in function calls that breaks it. It's pretty close, but just not interoperable for anything advanced.