which introduces to ext4 all the complexity problems which ruled out its being called ext3!
No, I don't think this is the reason. The problem with the "new ext3" is that someone upgrades the kernel, accidentally or intentionally mounts the filesystem with the same fstype, but with different options, then goes back to the previous kernel and finds that some of the files can't be read. I believe that a filesystem should be compatible with itself regardless of mount options.
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