One more thing to OPs original post: AppleTV the hardware and AppleTV+ the app are completely separate things... like iPhone the hardware vs. any single iPhone app.
Furthermore, AppleTV the hardware is much more than only a video streamer of local channels and stuff like Netflix or Disney+ just like iPhone is much more than only (text) Messages or only a phone. For example, it can be the ultimate music jukebox connected to probably the best speakers in your home. It can be a photo album. It can be the ideal home movie player. It can make all of your DVD or Blu Ray collection be available without having to locate and insert a disc. It plays many games. Etc. Its App Store is full of apps that are NOT video channel streamers. Explore and discover the breadth of things it can do beyond a single function.
It was originally nicknamed the iPod for your Television. Think of it like that... like an iPod Touch for your television. There is much more functionality than only streaming video apps.