I don't think you or most people understand the reasons behind moving away from the 50 year old technology of the 3.5mm analog headphone jack. All music files played on any handheld device today are digital. The audio jack requires an analog output, so every device has to have a digital to analog converter chip to convert the file on the fly. It makes sense to just keep the flow of digital to digital. And the biggest port now on any device is the audio jack, so it limits the size to which a device can be manufactured. So why should we stick with 50 year old technology and limit the size of our devices, just for nostalgia? Heck, let's just put the 8mm headphone jack on there too. When you have a look at old pc laptops of the 90's and see the massive serial ports on the back, you cringe. The same will go for the headphone jack.
The phone still has speaker for listening to phone calls and that speaker requires digital to analog conversion so you're not really getting rid of an internal DAC. Also, the biggest part on any device isn't the audio jack, I'd wager it's the battery.