ah, the change-the-topic trick 
and the Linux kernel is not an app, therefore doesn’t count.
LibreOffice is only preferred by a minority of companies, organizations and administrations, therefore doesn’t count. Also, LibreOffice has its roots in “professional”, proprietary software, therefore even more so doesn’t count.
Just like Blender can never count, as it was started by a company and furthered by paid developers.
And while KDE Plasma’s features have outnumbered the features of any Windows Desktop for decades, that does not count because it makes use of the Qt libraries, which, as we all know, are dual-licensed and also available under a non-free license and developed by “real” professionals. Also, it doesn’t count because <insert random reason>.
Free software developers just don’t have what it takes.
Yes. It’s that simple.
Because it would be unethical to charge for free software.
Therefore, it’s the fate of all those hobby-projects to be maintained by beginners who don’t really know what they’re doing.