Picture in Picture
A feature that's available on the Desktop and the iOS apps that isn't on Apple TV. It would be nice to be able to browse streams without having to quit the current stream. There would also need to be a mechanism to dismiss a PIP stream the way there is on the Desktop and iOS apps.
The "SmartTV Client for Twitch" third-party app happens to support picture-in-picture and other features at least for AndroidTV. Maybe there's something similar for Apple TV? The official app is more or less unusable in its current state.
Why is the image-on-picture icon grayed out?