This is the problem. iTunes may have been an acceptable interface five years ago but compared to the better "HTML5" web sites of today it feels slow, clunky, aw

This is the problem. iTunes may have been an acceptable interface five years ago but compared to the better "HTML5" web sites of today it feels slow, clunky, awkward and, most crucially, arbitrarily fenced in. Apple's challenge going forward will be to make interfaces that maintain their quality standards but with fuzzier boundaries with the rest of the web.