What else am I missing?

Large scale manufacturers pre-installing Linux? Readily available multi-language support for home users? Coherent UI regardless of computer and distro underneath. Billions on lobbying money spent on politicians for favorable policy crafting? Billions spent on marketing campaigns to actually sell the idea to the masses who simply don’t care any of your points (or any technical reasons, privacy or anything else that might be top of mind of the current Linux userbase).

I’d say Linux has a good chance of capturing 5-6% of the market in the coming years if lucky (I believe we’re somewhere around 4% at the moment), unless one of the big tech monopolies decides to start throwing money into it (Like Google did with Android)