YouTube is testing a new video button on its app, allowing users to easily access random Shorts content based on their suggestions.
Additional features of this play button are currently unknown, but it is likely to pull content based on watch history, subscribed creators, and video likes.
The feature is being tested with a limited number of people and does not appear to be part of an official YouTube experiment.
I don't mind videos that are exactly as long as they need to be, they can be 1 minute or 1 hour or whatever. But personally I don't need skinny portrait mode and no seeking.
Seeking is avaliable on the mobile app. You can also do this trick on desktop Firefox where you click the picture-in-picture button and press back or forward to jump 5 seconds.