If not for the fact that some commercial software addons work only in Excel I'll be using only Libreoffice for everything. In fact that's the only major thing that's stopping me from totally abandoning Windows for Linux as well.

I'm guessing that's the situation for several others though there could be other use cases that's Excel only.

Instead of pressing Microsoft, it would probably make sense to force such vendors (SAP, Oracle etc) to release their office add-ons for Libre office.

That'll kill two very profitable birds with one stone.