That wasn't me, but I agree. Especially for touch based and small screen devices like iPhones and iPads where HTML5 apps compete with native apps. It's much easier to create a fast and responsiveness non-standard UI natively than with HTML5. I haven't seen html5 app on mobile that has impressed me. Usually you can tell right away because they have unresponsive, laggy input.

I think the unresponsiveness is largely because of too much JS and poor event handling by browsers, myself. I refuse to believe JS execution can actually be that slow.