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.
I think you’re right, but I don’t think most people who use Linux care about whether or not it’s popular. Popularity is almost entirely irrelevant to the philosophy.
I disagree; I think that we do care about it being popular enough that it incentivizes software and hardware vendors to support it rather than ignoring it.