@flohack Hello. I tried it out. The phone screen becomes the touch bar and I was able to control mouse with it. I connected a full mouse and keyboard with the USB port of my phone.
Mouse and key board: The phone touch screen controls worked fine. I did notice that I was not able to scroll webpages through either the touch screen or mouse wheel. I was able to scroll through my contact list perfectly fine.
The external keyboard did not work at all. (There is one usb receiver for both mouse and keyboard. This works fine on other devices, like my laptop)
I did notice that any audio does not go to the connected wireless display (My TV). I tried playing youtube videos and the audio was coming through my device while the video plays on the TV. Similar thing happens when i play music on the Music app. (Comparing it with my laptop, when i connect it to the TV the sound also transfers to the TV)
Another 'glitch' that seems to be there is that the TV display does a blink in every 5 to 10 seconds. Its like the display goes away for a fraction of a second and then comes back.(Doesnt happen when i connect laptop to the TV)
Battery drain. battery dropped by 7% in 10 minutes. But this is an old device and the battery health is anyways pretty bad. (Maybe someone else can check the battery performance)