Why does the Xiaomi 6 not have a headphone jack?

Yes, Xiaomi 6 canceled the traditional 3.5mm headphone interface, but the phone has a headphone conversion connector (Type-c to audio) The phone package also has the conversion line as shown:

With this conversion connector, you can practical headphones to listen to songs. One end is connected to the traditional 3.5mm headphones, one end is connected to the charging port of the phone, even if you can listen to the song or there is a drawback, that is, you can not charge while listening to songs