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There is one thing your iphone as source to a USB dac cannot do, just as my android based phone over OTG to a dac cannot do either ... and why I am on this quest.
That is, play indefinitely, plugged in to a power source. You're either draining the battery while streaming over USB -or- charging. If there's a way to do both at the same time I have not found it.
With a DAP having an external non-USB charger, or USB charging with coax or optical spdif out, the DAP can double as a desktop music player indefinitely.
QI wireless charging. Charge your phone wirelessly while using the OTG cable.
No induction interference? My bathroom battery AM radio goes crazy with buzz if I get it too close to my electric toothbrush base charger.