While I have no issue with someone listing Debian as the number two distribution, it seems to me that the author wasnt entirely convinced that Debian belonged in the number two position in the first placed.
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Thinking about it, Im not entirely sure what constitutes an end-user distribution. Perhaps I am equating an end-user distribution with a desktop distribution. And why not? What determines if a GNU+Linux distribution is an end-user distribution? It seems to me that the packages that are available within the distribution, and the functionality of said packages, are what determines if a distribution is an end-user distribution.