That sounds like a circular argument: distros don't have XFS or JFS experts because nobody cares about them anymore, and nobody cares about them because distros don't have experts. But the code to all these filesystems is open and has been there for a long while; why do distros have ext3 experts to begin with?
The real reason ext3 is popular is (or so I contend) that it is stable and crash-resistant by default. Crash resistance may have been an design accident in the beginning, but it is what got it to be the most popular filesystem for Linux. It would seem that people are not so willing to trade robustness for speed. After all the mission of a filesystem is to keep your data until you ask for it; is it any wonder that people like it when it does just that, no matter what?
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