Do you have any performance benchmarking to show the difference between Excel and LibreOffice Calc, because my experience LibreOffice is much better on resources. I would like to see what tests you are using so that I can run them myself.
Keyboard shortcuts are huge. Also I’m used to the ribbon which I don’t think they copied yet
The ribbon has a software patent, if I remember correctly. Although it's a UI element, so I'm not sure if it's enforceable?
I am thankful that the ribbon UI is patented, it prevents that terrible experience getting more widely implemented
Good products are not just a collection of features.