Free isn’t the issue. Google’s office products are free, have mobile apps that work offline and while a desktop app isn’t a big deal for me, some who travel for work and use a laptop that may not have internet access all of the time - mostly on a plane - might care. WiFi is available on most planes and free with some airlines but is unreliable.

If you are in the Apple ecosystem, iWorks is free, has iOS and desktop versions for the Mac and a web version. But it’s the same argument for Windows users I had for GSuite.

The poster I replied to cares about open source I assume.