To make every application on every Apple device act and feel like every other application on every Apple device, and to have the software of every Apple deviceecho the hardware design it runs on.
It's understandable -- Miracast is a very recent open standard that lets you echo the display from an enabled device like a smartphone or tablet onto your TV (think Apple's AirPlay Mirroring).
This is very disappointing because this bug effectively makes everything we like about the Echo a moot point, as without rock solid 1080i playback, we couldn't recommend this device to anyone.