What's been driving me nuts is they took away the ability to toggle comments to the right of the video, so you could scroll them while viewing instead of having comments below the video necessitating scrolling the video out of view while reading comments. I thought that toggle was relatively new too.
You can still do it in YouTube Android app as far as I know. Open video, tap that little empty square in the bottom right corner and your video will be rotated to the horizontal position(view) and then tap that little comments box[0] in the bottom left corner(third icon).
