Bingo. You also need to know your camera. I have a d7100, a Z5, and the latest iPhone pro. For quick snapshots it's really hard to beat the iPhone. If I can get very close to something, the iPhone can also do some cool things.

My d7100 might be one of my favorite cameras of all time. I've taken very nice picks of birds mid-flight that would be very hard to do on a phone (impossible?). But, it's not a camera you pull out your pocket and start shooting snapshots. It takes time to learn and post-process.

They are all just tools, pick the right one for what you're doing. And sometimes the right one is the one you have with you :)