For scientific calculations with tables of data, I find LibreCalc better than Excel, so in my experience, Excel is the “good enough for simple tasks” tool, but LibreCalccis the tool when you actually do scientific big boy calculations.
The real issue is familiarity and importing, but if you start fresh, LibreCalc is better for me.
> writer, perhaps. calc, not even close
For what I see 99% of people do in excel (make a table, then sort it and draw some charts), calc would support all their uses just fine.
For those using it for actual accounting/financial stuff with equations in the cells, and custom macros, etc ... then no, calc won't be sufficient.