Guess what, that second DAC sits there idling whenever you're using the phone's wireless capabilities for audio. It also sit's there idling when you're not playing audio at all.
Yes, thank you for pointing out what is obvious to anyone with the slightest technical understanding. Ok, maybe not to the average share holders. But yes, thanks, I am aware of that.
But if you choose a weireless BT connection, at least at this technological stage, you have to accept a few compromises anyway: lesser sound quality and the fuss of charging batteries every few hours. The thought of an second idling DAC inside your phone shouldn't trouble you that much then.
For me, I prefer the convenience of a compact all in one device, where everything is centralised and powered by one source. My phone is usually at arms lengths away when I listen to music, I don't care about the cables then. And if have to use peripheral devices, I like them to be usable universally on all kind of devices.
But then again, I am old school. I also rather have a weired full size keyboard which is permanently attached to my iMac, which sits 25 cm away from the keyboard, instead of having a gimped one which I have to charge every no and then.
Ah, progress...
Just read the rest of your (slightly childish, with a noticeable tendency towards fanboyism) post and I realized that I am probably wasting my time. But whatever:
Of course when you tell them that your outboard DAC is perfectly matched to your headphones, providing significantly higher audio quality than their cheap Android internal DAC, I'm sure they'll stop laughing, because an Android fan, who even understands what a DAC is at all, is surely going to be very interested in the specs, because nothing wins an argument with an Android user like telling them your hardware out specs theirs.
As for the rest, they already argue that stuff already. In fact, they're already laughing at you and your overpriced iPhone 6S.
If you think, that a dongle DAC (which you proclaimed elsewhere) will be better than a built in DAC inside high end phones, then then everyone is laughing. At you!
And DACs perfectly matched to Headphones or external good quality DACs in general. Guess what: if the Android Fan wants that, he will probably buy one with a USB input, which he could use even with his computers.
Be careful what you wish for. If the iPhone doesn't contain any superior hardware anymore or specs like good quality audio are not part of the equation of internal specs, then software or the OS are becoming the main dominator or differentiator and people have to ask themselves why they are paying a premium over other brands, if the iPhone becomes nothing more than a shell with a battery inside (exaggerated)