Re: It's not just about Skype
But, firstly, that's not what the other commenters are all complaining about - they're complaining about Skype making IE bloated / unstable / spyware, and that they want to turn it off - basically assuming that the current Skype code is going to be embedded into IE to force people to use it. It's not.
Finally, remember that the version of IE on desktop has the same features and support as IE on Windows Phone. By building these features for IE, they're not just targeting the desktop, they're also targeting mobile, which falls right into agreement with what the ORTC CG have said.