A backup cable is definitely still a useful feature on Bluetooth headsets. My Bose QC-35s seem to only be able to pair with two devices at a time. I always sw

A backup cable is definitely still a useful feature on Bluetooth headsets. My Bose QC-35s seem to only be able to pair with two devices at a time. I always switch to the cable if I want to use them with my Linux laptop as repairing is a pain in the arse. I've also found the cable to be very useful for anything that requires both sound quality and a microphone at the same time. Over Bluetooth and even on my Apple stuff they seem to switch to the headset profile to use the mic and the sound then becomes aweful.