> So everyone showing youtube videos would be affected unless users also start agreeing to IP exposure

Yes, and that's a good thing! A web page should only communicate with the server i've reached, there should be zero third-party involved unless i explicitly consent.

That for example <img> tag can use an arbitrary URL is explained by the fact that back in the day storage/bandwidth was expensive. The same is true for video to this day, but i guess it's good that heavy-to-load content is click-to-play.