He really does not explain why he feels this way. Frankly, I feel the exact opposite, putting a better interface on DOM manipulation and simplifying the JS has made my code easier to read and follow. Just ask the Java developers I work with who are not asking "what does this do again?" nearly as much as they used to.
Agreed. I use jQuery on a fairly large scale project and the separation and modularization that jQuery allows has really improved the workflow. With jQuery, everybody can write code in separate files and it all plays nicely together thanks to the onready call back stuff. Seems like he's maybe just picking on the competition, though jQuery isn't exactly competition. Dojo is a really "heavy" framework compared to jQuery and is better suited to a different type of application, IMHO. --Erik