I’d love to shoot street photography with an iPhone. I tried it briefly last year with my basic iPhone SE. I liked the results but the ergonomics bothered me. It’s nice to have a camera that feels good in my hand and is always ready to go. My Leica M8 is the best for this. It’s on all the time and ready to shoot and feels great in the hand.
Eric Mencher has some great iPhone photography. I’m not sure which photos are made with an iPhone but looking through his photos is a real joy.