I don't have all that much experience with backbone yet, so I can't compare the validity of their approaches vs "plain" backbone. However, my understanding is that both these meta-frameworks were extracted from some pretty big existing applications, and contain patterns that worked for them, so it's probably unfair to say that they're only good for quick "toy" apps. These meta-frameworks wouldn't exist in the first place if people didn't find them useful for larger applications.

Otherwise, if these frameworks really are taking the wrong approach to solving these problems, maybe it would be more useful to document better approaches to solving them?