It's an Effing Beta, Technophobic Whiners...
It makes perfect sense for Microsoft's BETA to be shipped in custom mode, not standards-worshipping mode, because they're wanting to test their experimental technologies, more than the normal stuff.
If you can't understand that, you're not really competent to be commenting on such arcane things. Leave it to the techies.
Another thing you relative net newbies don't realize is that sticking to standards is inferior. You don't remember that, when Netscape had a similar browser dominance, it was in large part because they did NOT stick to standards, but constantly pushed the envelope.
Standards are established by bureaucrats attempting to GUESS what works best. The only way to KNOW what works best is to throw ideas at the real world and let natural selection run its course.
IE is actually maintaining their own dominance, in part, the same way netscape did...by innovating. The people who whine that Microsoft does NOT really innovate are being quite hypocritical when they turn around and complain that Microsoft does not stick purely to bureaucratic standards.
And no, I'm not a Microsoft lackey...I've not only been a web developer since 1995, when most of you guys were barely aware that some internet-thing existed, but have used Linux since 1993, when the kernel was in beta and there wasn't a window manager for X. I use Chrome as my default browser...but this "Microsoft isn't standards-compliant" whining is just pathetic.