OK, so hear me out. Wouldn't it be pretty cool if you could use your iPhone as a webcam for your Apple TV 4K and big-screen TV? Of course it would. So why can't we do it?
Normally I'd say that it's because Apple doesn't want to deal with cables and interfaces and generally making people jump through hoops just to watch grandparents talk to babies on something bigger than an iPad. But Apple already did the hard work.
