Amen. One other thing. A replaceable battery. Spending this kind of money on a device that I will use for at least 5 years shouldn't die a slow death because I can't change a simple battery!
That'd definitely be a useful feature!
I think, at least with the AK, HiFiMan, iBasso and FiiO stuff, they've been around long enough that getting a new battery wouldn't be an issue down the road. A pain in the arse, yes, but doable. I would not make that same bet with any of the army of other brands.