I am at a point where I can't use youtube on other browsers because of these missing features. However since the last big update the auto expand feature does not always work, I'd say once every 3 to 4 videos I have to manually expand the video to fit the entire screen. Also, the buttons are transitioning very slowly (3-4 seconds since clicking until something happens), sometimes they stay folded and the three dots do not appear at all until refreshing the page.