It's definitely has created distro hell. I feel like a huge reason Linux can't get more desktop share is because we don't combine our effort and a lot of duplicate work is done between the distros. It's inefficient. There are things like flatpak now though...
I think your comment has little to do with the fragmentation of the Linux kernel (which the GP was referring to), and more with the ecosystem around it.
Yes, it's fragmented, especially in the mobile and dev board spaces. That feels different than not knowing if two Java 11.1.2.3.4 builds are the same thing.
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Do you believe that the Linux Kernel is fragmented?