I was troubleshooting Bluetooth connection today and I thought that this is somehow related to software (PipeWire, bluez, bluetoothd and all that stuff). But no. Apparently Bluetooth barely works when WiFi antenna is disconnected from my ASUS motherboard.
Anyway, this might save a lot of time for someone, so I’m posting it here.
There’s sometimes conflicts when both BT devices have the same supporting chipset. It’s why I don’t like integrated wifi on motherboards - I can’t upgrade the thing to a newer spec due to hardware conflicts that arise (blame Intel and their drivers)