The people who say Open Office is great are the same people who say Linux Desktop is great for non-technical users. They're completely oblivious to the shortcomings. Impossible to get through to them, and they're perpetually clueless why most people will choose things like Gdocs and Microsoft.
The only people who had trouble with Ubuntu were IT support employees of a local telecom provider when they needed to configure a network on the laptop.
The Linux Desktop may not be "great" by whatever standard of "great" you come up with, but the state of the Microsoft desktop is slow, inconsistent, frustrating, and tries to upsell you, while also attempting to steal your data.
My tech illiterate mother got on a lot easier with modern desktop linux than she did with modern desktop windows.
Windows enjoys "ease of use" because of inertia, talk to someone who hasn't used Windows since XP and they'll find KDE a hell of a lot easier than whatever the fuck Windows 11 is doing.
A better direction for Microsoft is to make it free for personal use and charge the businesses.
Same can be said about GNOME.
Yes where what can't be done very well is CAD. All the top notch CAD of any engineering discipline is on Windows. Or Mac maybe.
Second come the games. You don't have Read Dead Redemption or Microsoft Flying Simulator with same fluidity as they are on Windows.