Use case 2: the Nintendo Switch doesn’t have BT audio, so I have to mess around with a wire, which is inconvenient. This solved that. (To get around the fact that the 1000XM3 doesn’t have AptX LL, I got the tiny FiiO BTR1K and a short 3.5mm cord and just attach it with gecko tape to the left side of the Sony.
https://www.amazon.com/Creative-Bluetooth-Transmitter-Indicator-Selection/dp/B089PYFLBN

