Chris Granger on his Light Table IDE:
One size does not fit all.
I mean this in virtually every sense. The things I showed in my concept video weren't meant to fit all scenarios - in that specific case they happen to fit Clojure very well. One advantage of focusing on principles over features though, is that what Light Table does and how it functions doesn't have to be the same for every language.
I think this is a really important concept, principles over features. The same fundamental goals can apply no matter how they end up as features. And guess which the users care more about?