Good idea, we’ll explore this further!
I agree with you, but this is unfortunately not possible at the moment due to legal requirements (user needs to accept T&C’s before they can use the editor). Could it be done in the editor? Yeah, maybe – but it’s unfortunately a much bigger task than just adding a download button. We are, however, discussing it in the team from time to time.
And a side note about the front page video; while a few lines of Vimeo code do load on enter, the video content itself is no blocker for the rest of the page to load. So the difference in speed of loading the rest of the content is not really slowed down by the video.