People saying libre office is a full replacement for Excel haven’t seen what excel power users in offices can do. It’s usually people who in another life would be programmers but for whatever reason they can’t/won’t make the leap out of excel and into full fat programming. Expecting these same people to convert to a free clone of excel that uses slightly different syntax and has less polish is a great way to lose a very valuable employee extremely quickly.
I absolutely love the environment that Linux affords one, and I would financially support the developers of the tools I rely on (which of course includes libre office) if I were in the financial position to do so, but I’m not delusional when it comes to the role Excel plays in the 21st century office. The business world is run from poorly backed up, undocumented Excel spreadsheets on anemic desktops, and that ain’t changing anytime soon