The Apple TV comes with a remote control, but like every remote control, it’s slippery and easy to lose in your couch cushions.
Meanwhile, owning an Apple Watch means you’ll never lose your remote control, since it’s literally attached to your wrist. It doesn’t have Siri – of course, the only time Siri is useful, it’s not available — but you can still use your Apple Watch to play, pause, scroll, and navigate menus.
To activate this feature, just open the Remote app on your Watch — it looks like a blue play button. I keep the Remote app in my Dock, which you summon by pressing the side button on the Watch, for quick access.