Saying that readers should be referred to a list article is a statement that categories are not useful for reader navigation. What then is the purpose of mainspace categories? Are you saying that we may as well do away with the whole category namespace? Or just that there should be no expectation that ordinary editors should be involved in category maintenance. This dumbing down of categories is a bad thing.
Category: current national leaders should always be an additional category to time-independent categories.
Camel's noses and slipper slopes are logically fallacious starting points. "current" can be overused, but if maintainable, it is a highly useful feature of Wikipedia to the readership.
Category:Current national leaders does not only make sense only as a subcategory of Category:National leaders. We have a recentism bias, and it makes sense. Ideally, Category:National leaders will be populated with all verifiable national leaders, in subcategories, probably both by time and by nation. --SmokeyJoe (talk) 01:54, 7 March 2013 (UTC)