(mind you, I do not listen with in-ear headphones when I actually want to enjoy music, but they sure are a lot easier to bring with me than my "real headphones")
Edit, as a bonus, as I almost always have my in-ears with me, is that I most often also have access to the dongle while in new environments as well.
I have no inherent issue with the removing the headphone jack since the included earpods do use a lightning connector. Not sure if those existed at launch