Programming Languages on the iPhone

So I read about how Apple banned many programming languages from use for iPhone apps today, and I had a reaction similar to Rob's. John Gruber thinks that Apple did this to prevent frameworks from targetting both the iPhone and other platforms like Android, but he also argues that applications built using such frameworks usually suck. This seems like a contradiction to me: if apps built these frameworks suck so much, why take the trouble to ban the frameworks? To me, the ban seems like an admission that many apps could in fact be "good enough" when built on such a framework. Apple simply wants to make life harder for developers of such apps who want to target multiple phones, in the hopes that they will decide to just focus on the iPhone. What a lame move.