Quality is also your stuff running on anyone's computer, and not depending on a big company that has the power to kill your stuff and force you to rewrite it.
Sure. That's nice about HTML, but too bad you lose almost every other quality thing because of it.
I don't understand why everyone is so hung up on HTML though. The internet is not HTML, the internet is TCP/IP and all the protocols that ride on it like HTTP.
Why can't we just leave HTML the way it is, use it primarily for making nice documents and come up with something new for apps? You know, instead of trying to shoe-horn everything into a spec that has to cover both apps and documents or anything in-between?
Why isn't there a standards committee for a kit like Silverlight or Flash? The runtime would have to be built once for each platform, but that's no different than HTML.