Of course the headphone companies like it. It gives them an opening to make people buy things they don’t need just to listen to music while Apple can save pennies on installing a lousy headphone jack.
It probably cost Apple more to ship the phone with the adapter cable than it would have cost to leave the headphone jack in the phone's design.
Apple has obviously decided that headphone jacks are clunky relics, and it's time to wean the customers off of them. Woz differs.