One of the main places windows is used, like it or not, are organizations and companies. Especially small ones. Specially ones that are not in wealthy countries. And the only thing that keeps them from switching to linux is microsoft office. (Most importantly Word, excel).

My company has ~20 people and I would switch them over to linux if it wasn't for word and excel.

While libreoffice is great on it's own, companies send eachother xlsx and docx files. And libreoffice isnt great at reading or writing them. Specially complex ones. I don't think it's much of libre office's fault, but more the shitty incompatible, unstandardized microsoft formats.

Currently I'm the only Linux user in the team, and I constantly advocate Linux, but I know if anybody switches, compatibility with microsoft office is going to be a problem. I can take the risk with the tech team but not the office section (hr, sales, secretary accounting etc.) really.