I use the apple headphones, and every new phone I've got includes a pair so I'll just use the pair that come with the iPhone 7. Nobody can say that the leads/socks won't go wrong but my experience with mini-jacks is that they almost always do wear out over time, so I'm welcoming any developments which mean I won't be twisting the cable round in the socket to get stereo to come out. And sure nobody needs a thinner phone but I tend to see improvements on making phones thinner as a good thing. I always add a case, so anything which keeps the bulk down is a good thing.