I doubt Daniel would have introduced it if it was "un-necessary" or "pointless", I believe from memory it was to improve the handling of paths over a wide range of set-ups and environments (where sometimes it would fail). You would need to git blame the file and find the revision where it was introduced to confirm if that is truly the case (or if i'm mistaking it for other code)
I've looked at the annotations and what I've seen is that PathRouter only fixes https://bugzilla.wikimedia.org/show_bug.cgi?id=32621 by using path weights. Actually, I've started looking at the routing code after hitting this same bug with img_auth.php action path. But as I understand, it could be fixed much simpler just by reordering two parts of existing code and examining $wgArticlePath after $wgActionPaths :) And a single extension using the PathRouter is http://www.mediawiki.org/wiki/Extension:NamespacePaths ...
Of course I support new features, there are some features that I myself would want to be in MW core :-)
And I'm sure my point of view may be incorrect :-) but MW trunk (i.e. master) slightly frigtens me when compared to previous versions - the codebase seems to grow and grow and grow having more and more and more different helpers... And it becomes more and more complex with no simplification effort... (or maybe I'm just not aware of it)
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