I think I could probably squeeze more life out of my phone, but the 17 has a nicer camera, me and my wife are noticing our relatives with newer iPhones have photographs that look slightly (I meant to write NOTICEABLY here) better. As we raise our first child, having a quality camera is definitely important to us.
I was really tempted by the iPhone Air, but the Pro has better camera features. I am actually really excited to see what they will do for the iPads. If they release a thin iPac Mini similar to the iPhone Air, I would immediately buy it. I am not usually a fan of thin, but something in me has always wanted a thin iPad Mini, not sure why, but I'm waiting for it still.
Great demo, the most impressive demo had to have been the Airpod Pros translation piece.
Edit: Needed to annotate that I wrote 'slightly better' but its not just slightly, we both visually noticed a different in quality.
One last note, the 12 Pro was my first iPhone ever. I was on Android since 2009, every Android I had lasted about 2 years. My last one probably would have lasted me 5 years but I was tired and wanted a change at my 2 year mark. I have not regretted my decision to date.