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In order to provide an overview for the rivers in Spain, I have made this an all included category...Jokulhlaup (talk) 10:45, 22 June 2015 (UTC)[reply]
I seem to remember that six months ago, this cat did contain the majority of Spanish rivers, so it was only recently that they were subcategorized. The benefits of all included, are that it is alphabetical unlike the List of rivers of Spain, it is self-maintained, it makes it easier to find a river without having any prior knowledge of which autonomous community it sits in, and gives a count of the number of rivers. As I said before it is consistent with the adjacent Category:Rivers of France and Category:Rivers of Portugal, with Spanish rivers crossing their borders. Looking at the US, the two states of similar size to Spain, both use the all included scheme. See Category:Rivers of Texas and Category:Rivers of California...Jokulhlaup (talk) 13:01, 22 June 2015 (UTC)[reply]
I see two main reasons against that:
Including all the instances in a single list is not the aim of a category. That is the function of list pages.
Texas and California are not independent countries, so they are not to be taken into account in this subject.