Windows 8.1 had no built in DVD player. Nor did Windows 7 Starter or Basic. Further, I suspect it's a feature that the vast majority of people have never used, exactly why Microsoft decided that they wouldn't subsidize the licensing for no reason. This is a very 2002 discussion.
Not that your point isn't valid -- at least for those users who ever actually tried playing a video DVD, and who had a supporting version of Windows -- it's just pretty odd that such a comment sits at the very top of an enormous technology event.
The Tesla doesn't come with a holder for my buggy whip.