Yeah... so besides not using shitty TTS for auto-dubbing, something else I would do is add a button to manually request auto-dubbing for an older video.

With how much content gets uploaded to YT constantly, I get the feeling auto-dubbing will be a thing for new videos, and older videos will stay as they are. Or if they do get the feature, they'll be at the bottom of the work queue.

So instead, have an option accessible somewhere, to request a video you're watching be put at the top of the queue. And then you get a timer for how long it will take for it to get translated. It would probably be a matter of minutes, so you'll be able to restart the video with dubbed audio afterwards.