And it keeps getting worse. Before, videos I had already watched would have the thumbnail dimmed, with text on top. Now there's a thin red line under the video

And it keeps getting worse. Before, videos I had already watched would have the thumbnail dimmed, with text on top. Now there's a thin red line under the video thumbnail that displays how far into the video I was last time. It would be really useful to be able to go into a user's profile and filter out the videos you've already watched, or filter them at all. It would also be nice to have a proper category list. This is obvious functionality, that they must've left out on purpose. But why?