Who cares! Some Company will make a headphone adapter for it then you can use your original headphones again
Some company called Apple, and it's in the box with the phone.
This one isn't free, but it lets the user charge the iPhone 7 while listening and also change volume, tracks, and answer the phone, etc., on headphones/buds that don't support that kind of activity. Oh, gee, that kind of shoots down all of those complainers, doesn't it.