If they mean modernmetro, they are powerfully ignorant.
Having one tiny bloated calculator-app using one entire quad-HD 27" screen,
while some other tiny app hogs the entirety of my other quad-HD 27" screen,
that's not what any sane well informed person would call "powerful multitasking" in 2014.
At this rate Microsoft will have to run for miles and miles, standing still in one place, before they catch up Microsoft from 10 years ago.
But they recently re-discovered the contexts-menu, so I have faith that one day they will rediscover the window too.