Stuff like font rendering, grammar- and spellchecking, the exact set of Excel formulas, graphs, templates, and VB scripting matter. The office suite’s localization changes keyboard shortcuts, Excel formulae names, and swaps between decimal points and commas. It is absolutely horrendous, but people rely on it for their daily work.

In essence, if we accept that Excel is both an IDE and a dialect of a programming language, we can compare it to asking what makes C# in Visual Studio worse when people are used to Java in IntelliJ. The answer might be “nothing, but I’m used to my setup and it’s ridiculous that I’m even having this discussion about my main work tool” for programmers, Office users, and video editors alike.

If you're forced to script in something else then why not just go to something else. Additionally, having tons of forms written by long gone employees just not port over is a tough sell at smaller offices.

But the difference is not 'killer features". The difference is in the million small details and polish. The integrations, formats, UI, workflow, things it just "gets right" that I don't even know its doing.

I try Libre Office every once in a while. But each time I try it just feels old and clunky. It's all in the tiny details that add up to the overall experience.

Clearly you're not missing anything since you're happy with what you have. But going from Office to LibreOffice is painful. Not bullet-wound painful, more like thousand-paper-cuts painful.