I'll reread the article when I get home, but I was under the impression that the powers didn't explicitly exclude non-simple weapons, rather it gave bonuses for using simple weapons to put them on a much more equal footing as the non-simple weaps.
That being said, even if it doesn't allow non-simple weaps, I still think this works as its giving each of the different leader builds their own little niche. Battle clerics use simple weaps with two hands while handing out an assortment of buffs. Warpriests likely use a shield. Runepriests will likely use superior weapons to deal large amounts of damage, etc. With luck, when they are all done (still anticipating some runepriest love) each of the different classes/builds will have their own little niche and be relatively balanced with each other as they'll each have their own pros and cons.