AFAIK it depends on the adapter, some phones have an inbuilt DAC and literally just use pins in the USB-C port for headphones, which means the dongle is literally just wires.
Other phones don’t have that and require the dongle to have its own DAC.
You probably used a simple adapter on a phone which didn’t have those headphone lines in the USB-C port.
You can always just use a usb-c to 3.5mm.
no charging then
That doesn’t work on other phones. I’ve tried.
AFAIK it depends on the adapter, some phones have an inbuilt DAC and literally just use pins in the USB-C port for headphones, which means the dongle is literally just wires.
Other phones don’t have that and require the dongle to have its own DAC.
You probably used a simple adapter on a phone which didn’t have those headphone lines in the USB-C port.