Dismissing E17, because it takes time to do think technically right is quite abusive. First of, E17 first needed a modern cleanly designed toolkit. So a massive amount of work was moved into it, to get the lightest, and certainly the most efficient toolkit. With that toolkit, it was possible to write a new terminal in less than one month : http://www.enlightenment.org/p.php?p=about/terminology . Terminal that is faster and lighter than most existing alternative, but still highly themable.
The main reason E17 was never released is that it reached the good enough state and nobody cared to make the last step. In fact most of our community is focusing on the library instead of releasing application. Thanks now, some people are taking care of that last move. But the good enough and the fact that we were fine in our sandbox is the main reason of this slowness.
So don't dismiss technology if you don't know there story and what they can do.