If you are hard of hearing and your partner isn't, adjusting the volume of a TV becomes a problem.
A solution is to use a headphone with volume control.
A practical problem is most TV's mute the moment optical or headphone out is used.
You can circumnavigate this by using a Bluetooth sender with a pass-through to the AV or soundbar.
Avantree Oasis Plus Bluetooth transceiver with simultaneous output to two Bluetooth headphones & Wired Sound bar.