Why do I need Apple Tv
Do I need Apple TV subscription if 8 already pay for YouTube TV?
Apple TV HD, tvOS 26
You do not “need” an Apple TV subscription when you already subscribe to YouTube TV, and if that is enough for you.
The Apple TV subscription service gives you access to the constantly growing catalog of (mostly Apple produced) movies and TV shows, also known as Apple Originals — content that is not available elsewhere.
About Apple TV streaming service - Apple
Apple Originals - Apple TV Press
List of Apple TV streaming service original programming (episodic/series) - Wikipedia
List of Apple TV streaming service original films - Wikipedia