The question is, does the Mate 20 deserve to exist in a world in which the Mate 20 Pro is a thing Yes. Yes it does. It offers much of what makes the Mate 20 Pro great at a lower price, and adds a headphone jack.
Excellent battery life; Incredible power for the price; Versatile stills and video camera
Full HD+ screen resolution is low; IPS screen inferior to flagship AMOLEDs; No IP68 water and dust resistance