As my wife likes to watch TV at a much lower volume than I do, I originally bought the Sonos Ace headphone so that I can watch TV at a much higher volume with her while using the Sonos Arc Ultra. In fact, I had a live Chat with the Sonos tech before my purchase, and I asked the person this specific question. The tech responded positively saying that both the Ace and the Arc Ultra can be playing sound coming out of TV. I found out after the purchase, this was not the case. What a big disappointment.
I wonder whether it is technically positive to enable the TV sound swap feature of the Ace while maintaining the sound coming from a sound bar. It it is, would others be supportive of asking Sonos to enable this feature for lots of people who, I am sure, would have similar issues with partners who wish to have a different sound volume while watching TV together?