I don't miss the headphone jack. At first, I was a bit pissed. Two reasons: I can only use my headphones with the iPhone, so I need to bring two. I can't use any other headphone with the iPhone, so I need to bring the iPhone one.
Why I don't miss it? The old headphone jack is not good. First, it has more risk of either breaking (itself) or putting another force on the entry of the device. Second, the audio transmission sucks. The old jack, for some reason, has lots of interference. I'm having this problem with the iPad and Macbook.
My only issue: I want the iPhone jack to be USB-C compatible, or the iPhone/Macbook Pro standard to be compatible.
Good riddance old jack.