Seems to me that anything beyond the actual hosting and serving of the video file is unnecessary to include by default in a federated video streaming solution....
You are basically saying "Other than the most expensive and complicated parts" the rest is easy or unnecessary. Which isn't necessarily accurate but still is being a bit dismissive of the problems at hand.
And one of the biggest criticisms of Peertube (aside from the dearth of content, which helpfully avoids the "expensive/complicated" parts) has been Discoverability. How do people watch your videos (or your playlist) if they don't have a way of knowing that your videos even exist?