The problem is all the users Microsoft will leave stranded on IE10 after web standards have progressed beyond that point, just as they've done with every previous version of IE. Microsoft is simply too slow to release new versions of IE, and too restrictive of the versions of Windows supported with each release. Nothing has changed with IE10, and developers will be working around its idiosyncrasies for many years to come, long after IE11 and 12 are shipped.