I just did the same thing earlier with a video. Having the url tags makes it so that anybody who clicks on the video to watch it will load up another tab of the video on its YT page.
Yeah, it's just the embedding cocking around. Fingers crossed for it not being delayed any further. I'm looking forward to coming across the Holsom twins sooner rather than later.
Well, constantly switching to a new engine every time a new technology came out is probably the biggest factor. They had to start again from practically scratch every time.