Linux is super fragmented (and generally has been historically).
If more people in Linux agreed to develop, use, and support the same distro–similarly to how most of us use the same kernel–then that distro would probably be better than Windows and more people would move to Linux.
Sure. Most people will stick with Windows or macOS and that doesn’t bother me. In fact I’m happy that people who want simplicity have those options because it means less pressure for Linux to turn into that.