I can't leave iOS because I value privacy, but I will not buy new phone until there's one with a jack.
1. there is no advantage to not having a headphone jack - only a loss of choice. Don't tell me there's no room - make the phone marginally bigger.
2. it's anti-consumer - they're attempting to shift headphones from an item which could potentially last a life-time to a subscription model ('disposable' bluetooth headphones). It's all about the $$$$, **** the user. Very few cross platform/cross device open source standards exist, and 3.5mm is about the most useful in existence.
3. "why not leave the dongle on the headphones?!? you're attention seeking!!" - You cannot use a single set of headphones, with multiples macs and an iPhone - this workflow is not compatible with leaving the adapter on the headphones.
4. "AirPods solve everything" - I'm glad you like them, I know they're great. I'm glad apple sell them. But give me back my ****ing jack - I don't want to subscribe to my headphones (lithium ion batteries dies after a few years making them a disposable item meaning I have to re-buy/resubscribe to continue my experience).
5. I don't want to charge my headphones, and I don't want my headphones to die.
6. I don't want to use Siri to change the ****ing volume. Inline remote works perfect.
7. Wires. Never. Bothered. Me.
Bluetooth audio can and will co-exist.
But there is no good reason aside from making more $$$ to remove the jack.