Why do all my other Apple devices not care if the movie I rented from iTunes if it was downloaded directly to that device or not, but the stupid Apple TV won't allow you to play rented movies unless you rented it directly from the Apple TV?

Why do all my other Apple devices not care if the movie I rented from iTunes if it was downloaded directly to that device or not, but the stupid Apple TV won't allow you to play rented movies unless you rented it directly from the Apple TV?

Great, so now I have to airplay it by linking my computer to my Apple TV and then the movie has to buffer! So, all that time I spent downloading the HD video has to technically "download" again by buffering. The more I use Apple TV, the more I feel like this item was not created by Apple. I don't even use it for what I originally purchased it for. If I would have known that anytime I wanted to sync a movie from my computer to Apple TV by using airplay that it would have to buffer the movie, I would have never ever ever ever ever purchased this waste of time device. So the video has to technically play all the way through one time first so Apple TV can "remember" the movie to play it back in real time afterwards.

Am I missing something here? Am I doing something wrong that can be fixing my problem? I should have known that the Apple TV had so many things backwards when simple things like when you are using the remote and you reach the bottom of your list, in order to cycle back to the top of your list you have then press the directional buton back the other way rather than most modern day devices that will automatically cycle you back to the top or to the other side when you reached the bottom or end but keep on pressing the button. That **** annoys me when I am doing a search for a movie and have to type the name in manually and have to cycle back and forth to the letters. It makes me feel like I am using a rotary phone or something!