The Huawei P20 Pro lacks a 3.5mm headphone jack. I personally wish that it would featured one. I have nothing against the USB-C connector, but dropping the 3.5mm jack means that I need to buy a special adapter for it. It's not a huge issue, but it make things so much easier or people who already own a 3.5mm headphone and all they need it to just plug it and enjoy their music.
So it's kind of sad seeing the 3.5mm jack ditched out. Fomr looking at the phone's pictures, I think that Huawei removed the 3.5mm jack in order to make room for the second speaker grille so they can put a dual speaker grille arrangement at the the bottom of the phone.