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.
To be fair, there’s already a general consensus in which are the “beginner friendly” distros, which includes the community support and familiarity with windows. Most people would probably recommend Mint to a new or switching user, for example.
After someone is used to a more basic linux distro, diversity and complexity are pros rather than cons. “Oh you need a distro with super specific specs for a niche use case? There’s 5, you can pick or try them all”. I could have linux on every machine i own, including a TV or even a thermostat, and I’d have a different setup.