I don't think we disagree at a fundamental level. My thought on reducing fragmentation is to reallocate those resources to fix the broken software and to make everything better and smooth. That last 10% to make the UX really good isn't something most people like doing, but it's something that macOS and Windows both spend a lot more time on that Linux.

Due to the fragmentation, I don't think most users make it far enough to run into the application or UX issues. It seems like reducing fragmentation would get more people into the door, and once they are in the door, having those developers work on making the core experience better, is what keeps people around. Once the platform has more users, that will bring in even more developers... the ones who are there as a job, not just enthusiasts, which should lead to an upward spiral for quality.

In terms of the large distributions not being able to be consolidated... I don't think the average user (read: typical Windows and macOS users) care about any of that, other than not having to go to the CLI to change a config. A user should not need to know what glibc is.