I'd like to use it for watching Netflix/Hulu/etc on a plane on a larger screen than my phone without being forced to carry an iPad.
I really wish Apple would just force companies to enable their iPhone/iPad apps on Apple Silicon. But if I could display a video from my phone onto my 15" laptop screen, that would be a nearly as nice.
You can already AirPlay from an iOS device to a Mac– doing this on a plane is a bit trickier because of the networking setup though. I think I have managed to successfully do it once by either
1. doing some sort of tethering/creating a local wifi network on my Mac
2. connecting both devices to the in flight wifi
I use AirPlay to my Mac (and external monitors) even at home since I can watch the 4K feed from apps, which isn't available for some services if you use the web browser (cough HBO cough),
I really wish Apple would just force companies to enable their iPhone/iPad apps on Apple Silicon. But if I could display a video from my phone onto my 15" laptop screen, that would be a nearly as nice.