You're right. But centralizing this sort of thing makes long term planning for that sort of thing easier. And by putting it in core you get more eyes on it and hopefully more people caring :)
Well, it doesn't matter where these things are, in core, or externally - in both cases people ignore issues filed about problems :)
(e.g. https://bugzilla.wikimedia.org/show_bug.cgi?id=23339 )
Domas