I have a feeling you are not clear as to the purpose of ARC.
For a component like a PS4, which goes PS4 --> Receiver --> TV, ARC is not needed. The receiver will extract the audio component and play the speakers while passing through the video portion to the TV to be displayed.
The ARC is intended... say you have an Aerial (antenna) and you are watching a HD surround broadcast. Now obviously you want to listen to it in all its surround glory on your receiver's speakers, how does the audio gets from Antenna --> TV --> Receiver? ARC. Without ARC you would have to wire a separate audio cable (typical Toslink) from TV --> Receiver.
Now if you are telling me your PS4 HDMI goes directly to the TV because of whatever reason, your...