https://www.apple.com/ios/carplay/
See anything there that refers to watching video? Or mirroring?
Subaru did not rewrite ACP to enable this. Your friend did something to enable that (yes, probably jail broke it). It is NOT native to ACP. Fact.
Just like you surely could figure out a way to do it with your Android phone if you'd spend some time Goggling it. And I promise it would be easier with Android then Apple because Android isn't as locked down. Also fact.
How out of touch Android is? You are so clueless, it's almost funny.
Please switch to Apple. You're embarrassing me as an Android owner. You no doubt are the Apple type anyway.
I rarely watch stuff on my phone. I clearly said if I wanted to I don't need to on my dashboard... because I have a phone that I can do that on. I don't even understand the mindset of wanting to watch it on the dashboard.
I frankly don't give a s*** that the 2 or 3 vehicles you've owned since 2012 let you watch video in the dash. It has certainly never in history been a common thing... except in minivans. And even then the video isn't ON THE DASH.
I've had exactly zero cars that did this.
Nor did I ever think it was something I wanted even after I had a child.
Please...
Get an iPhone.
https://swappa.com/buy/iphones