It was not well exposed, and unavailable completely on the iPad version of their app, but it was quite useful between my wife and I for sharing videos asynchronously.
Youtube's UI is a fucking disaster, like most of Google's interfaces tbh. To this day, I don't know how to get to a list of all my videos; I either literally google for it, or just click around randomly until I finally find it.
It doesn't help that the Google+ profile they forced on me _also_ has a YouTube account, and I've uploaded some videos to the wrong one, so I get to do the dance twice.
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?
I'd love to be able to filter out videos I've watched that way. Speaking of which, I've noticed that the red line tends to disappear after a while, causing me to start videos I've already seen.
That just shows me what other people see when they view my channel. It doesn't show me the unlisted/private videos, nor does it let me _manage_ them in any meaningful level.
Clicking on "Youtube Studio (beta)" will show me some videos with checkboxes, and let me do some editing, I think, which is probably the thing I'm usually looking for.
Yeah the thing is there's a million other ways for you two to share them so to Google it was a low volume product with a lot of risk for harassment and little utility.