Hm, the spam problem is annoying... Can we have a "report spam" button? And if that button is pressed by X amount of people, the post automatically gets hidden until an admin checks it.
Ok, so the question is: "Why using this component instead of just using <link rel="import" />", is that correct?
Well, the answer is because import != include.
hehe, interesting that you mention this, since that very distinction was the reason for the creation of this component on the first place.
You can read the discussion that lead to the creation of this component here: https://github.com/w3c/webcomponents/issues/280