I think there are maps that are not up to standards. Removing them is however quite tricky, because it often also means removing content used only on that map. Say, for instance, Mersa Matruh and Sidi rezegh were removed. This would also mean removing the hotel, mosque and Sidi Rezegh HQ / tomb etc custom buildings, which were made by people who are not the mapper, as well as the Valentine tank, which would then be unusable in the mod. One reason Aberdeen was removed was that it used only generic statics and tanks that are also available on tons of other maps.
In an ideal world, these maps would instead receive overhauls, but manpower is way too limited to do that, not to mention that some of the maps (Mareth Line for example) have big structural problems that were done wrong in the planning stage.