> What kills me with the autoplay (at least on mobile), is that the video continues from where it was when you click it. But the autoplay had no sound, and I probably didn't watch it closely.

As a counterpoint I love that feature on desktop and use it all the time.

Often I don't even click videos but just watch them with the preview autoplay (with sound enabled). I also zoom in on my mousepad so that it covers the whole screen and I only need to click through to like the video or for the comments. Much more seemless experience for me.