I don't see why the "issues" with the <video> tag couldn't be fixed in the video tag?

"Autoplay video is used for ads and thus controlled by browsers" (and <img> video won't have the same development?!) and "<video> can't be saved" (yes, if you use a JavaScript player that interferes with it, if you just link in a file through a <video> tag at least FF and Chrome do have a save option) seem especially nonsensical.

I guess there is some semantic argument for "videos that should act like images", but I somehow doubt that'll happen nicely...