Amazon's killer feature for this phone and the Indian market(which suffers from extreme levels of noise[1]) may be a great quality active-noise-cancellation at a very low-cost, and with USB-C analog support(so you can put noise cancellation chip in the phone), detachable cables, and Amazon audio/chip expertise it seems possible.

[1]http://www.npr.org/sections/goatsandsoda/2017/03/28/52014087...