Who expects radios of any sort to work without antennas attached? A better question might be why Wi-Fi worked at all in that state.
Wi-Fi uses a lot more transmit power, so it's better able to make up for the extreme attenuation that comes from not having any antenna connected.
Not only does Bluetooth use a lot less power, but modern Bluetooth audio uses all ...
Bluetooth 5 is only backward compatible to Bluetooth 4.0 and 4.x devices. Not farther back than that.
Bluetooth 5 compatibilty
Bluetooth 5 is only backward compatible with Bluetooth 4.0, Bluetooth
4.1 and Bluetooth 4.2, but to get the speed and range improvements you will need to have a Bluetooth 5 device connecting to another Bluetooth
5 device. If you buy ...