Because, after all the crybaby tantrums, it turns out that nobody really wanted a headphone jack, they just wanted to be whiny cunts. This is the proof.
Go on and throw a tantrum and downvote. The proof is here. Everyone who pissed their pants complaining about this was wrong. Nobody gave a shit in the end other than for their own ability to whine and complain.
Meanwhile, all of the adults in the room just moved to Bluetooth. Most of us did it years before this change. And that’s why they remove the headphone jack. That’s why everyone else is doing it too.