So let me get this straight, you think that using an onboard DAC to act as a crutch for that old port is the "old standard"? There's nothing analog about that jack that isn't the same as what is in this headset. In fact, when you take a step back and look at this solution vs. the headphone jack, it's even more of a simplification and a return to the "old standard" as it was in the days before CD players.
Firstly, you clearly don't know anything about audio so please do some research before you start talking about DACs and analog connections.
That's not the only difference, but Apple provided you a method of using that old 3.5mm jack, didn't they? It's in the box. And introduced their solution that isn't proprietary, bluetooth. Now, I'd give my left arm to have iPhone drop Lightning and go USB-C but that's another story.
Secondly, bluetooth does not meet the fidelity of a wired connection, and an adapter is not an adequate replacement for the actual port for a number of reasons, including the fact that it continues to rely upon Apple's proprietary connection standard