The biggest upside compared to PeerTube is probably discoverability. In ActivityPub, the network architecture means the video ecosystem is fractured and there’s no one cohesive place to find all PeerTube videos.

In atproto, the network is continually indexed by relays, which means that it doesn’t make a difference what app you use to watch videos - you’ll find the exact same ones regardless of the platform, since they’re all working from the same data.

This also means that different video platforms can provide different services for users without locking in users to their platform. Platforms would be forced to compete on what they provide to the user experience, not how well they can lock in users to their platform.