It is clearly best to connect the cable box and blu-ray player to the receiver rather than the TV. Very few TVs will pass 5.1 soundtracks arriving via HDMI through to a receiver. So, you will almost certainly be limited to stereo from those sources if you connect your devices to the TV instead of the AVR. Even if you have a rare TV that passes through 5.1 tracks, it definitely will not send the high quality lossless DTS-Master Audio or TrueHD audio to your receiver.
If you connect the devices to the receiver, then you never need to change inputs on the TV regardless of what you are watching. Just leave the TV on the HDMI input from the receiver. But, you will need to select the correct input on the AVR for either the cable box or the BD player.
Since you appear to have passthrough on your receiver, you can listen on the TV by simply turning up the TV sound.
You can see there's no usage of ARC in any of this, except that configuring passthrough usually involves setting up HDMI-CEC (Consumer Electronics Control), which happens via the same HDMI ports that support ARC.
You don't say what device you use for Netflix. If it's your cable box or BD player, then that would work just like watching TV or playing a disc. But, if you have a Smart TV that is the source for Netflix or any other app like Amazon or Hulu, then you would need to get the sound from the TV to the receiver. You can use ARC for that or run an optial cable from the TV to an input on the receiver.
Last edited by BIslander; 04-02-2020 at 05:24 PM.