Would you be OK with having every website you visit run native byte-code on your computer !? At least for me, it takes some trust to install a native app. I don't trust some companies and would never let them run a binary blob on my computer, still I sometimes visit their web sites, with JavaScript turned off of course. Some sites require JavaScript though, but I can turn on selective parts (using NoScript plugin) and then investigate all the nasty stuff with the browser's built in debugger.