You're not getting down voted for not following groupthink. You're getting doe voted because you're making a bunch of assertions of your opinion as though it's fact, without actually trying to justify those opinions.

On the substantive point, a couple of years ago I wrote a graphics framework. It used JavaScript core and directfb. I could have just told the app developers to use WebKit, but the performance just wasn't there. I'm pretty sure that's also the reason that apple, Google and Microsoft write native GUI sdks, and not to lock in developers.