I wouldn't get too excited. my pixel 2 came with a headphone jack dongle. the audio quality was not great, and according to forums I read at the time, that OEM dongle was actually one of the better ones.

to be fair, I believe that was an actual DAC in the dongle. I suppose in theory you might get better quality with analog passthrough from an onboard DAC. I doubt anyone other than apple would bother putting a decent DAC in a phone with no headphone jack though.

Supporting analog audio out over USB-C is definitely something that varies from device to device. Some adapters are passive requiring the device to send analog signals or some devices can be active in which they have their own DAC and expect a digital signal. Some devices will have their own DAC on board and can support a passive device, some devices do not have one and will require an active adapter.

Generally speaking, you'll probably have more success with active (DAC-based) USB-C to 3.5mm adapters.

They don't support analogue audio signals - USB is a digital interface - you use a DAC to convert the digital audio signal to analogue.

USB-C absolutely supports analog audio signaling, it's called "Audio Accessory Mode" in the standard.

this is incorrect, look at the spec. I would not have commented something like that unless I verified it first