Hello. Exchanged a few tweets with Dan Auer about autoplay as I've generally not seen useful suggestions of it. For instance, today when I finished Mass Alex it's suggestion was the Google stream from last week, which I saw already. I had watched it on Youtube, but there was a brand new QL it could've suggested instead. He asked me in a reply to post my expectations here, so here I go.
My basic expectation would be for recent videos the specific show doesn't matter. If I'm not watching through old episodes what I mostly want to do is watch the latest episodes of shows I follow in the order they've been released. So if I'm watching Die Another Friday I expect the suggestion should be Unprofessional Fridays. And if I finish that on Saturday the next suggestion should be whatever QL hits Saturday morning if one does. Only when there's nothing newer should it go backwards looking for autoplay suggestions, I think.
Alternatively, when watching older shows I do think that it's probably right to stick to the next latest episode of a certain show. So if you've just watched a first episode of an Endurance Run makes sense to suggest the second. Or if you watch an old QL the next old QL makes total sense. However, there should be some exceptions in there. For instance, when one watches "Hitman: Episode 5: Colorado", they probably want to watch "The Second Half Of That Hitman DLC: Colorado" next if they're a premium member. Same for cases such as when GB Makes Mario levels have been uploaded during UPF or other streams.
I admit that figuring out when you use latest rules and when to use archival rules is tricky, especially when you consider edge cases like This Is The Run which update multiple times a week. However, I have an idea that might help.
If someone gets to a video using the "Latest" Carousel on the home page, it would follow that they want to watch things in latest order. Conversely, if they get there from a show page or a show carousel, they'd probably want to watch it that way. What I would suggest is use origin to determine the default, and then have a way to change what carousel is below a video (a dropdown maybe), and have the active carousel determine which video is next. You could see latest (like before the rework, which I used almost exclusively), or a show, or maybe even game specific carousel if the game has multiple videos. That would also happen to solve the Hitman problem described above, since Colorado and The Second Half of Colorado would be next to each other in a Hitman Specific Carousel. In time you could even consider custom playlists as a feature. There would be a concern for long streams where many games may be played, the drop down might have a lot of entries. Unsure if that would be a problem. Probably not an insurmountable problem though.
Good luck, this seems like a lot to figure out, hope this helps.