Microsoft and IE drag their heels at every opportunity with the web. I'd be happy to see IE completely fade into obscurity going into the future.
It's slowing progress down regardless of what their new fangled marketing campaigns say and we don't need it anymore.
I do not see how the non-support of WebGL and Ogg supports your position that the IE team is dragging its heels.
Chrome and Firefox do not support CSS Grid Layout or CSS Regions by default, but that doesn't mean their teams are dragging their feet.
Microsoft and IE drag their heels at every opportunity with the web. I'd be happy to see IE completely fade into obscurity going into the future.
It's slowing progress down regardless of what their new fangled marketing campaigns say and we don't need it anymore.