Battery: For a 700$USD player coming out in 2015, 10 houres of battery life is totaly unacceptable... hell it should be minimum 15 houres and idealy 20 houres. If you have to make it heavier then be it!
Data Transfer: What still USB 2.0!? Its got to be a joke again at such price and by today's standard. You can already have USB 3.0 on a 15$ flash drive but at least since 90% of the music will be anyway on the external TF cards then I guess it doesn't matter much if it can help lower the cost as most people will prolly be using USB 3.0 SD card reader to make their transfer. Also why the heck have wifi?! It's totaly useless and will raise the complexity and price of the product to isolate it even further from the radio frequencies. It's really not necessary! Same thing for Bluetooth, seriously... no one is ever gonna use a cheap bluetooth earbuds on their 700$ DAP.
Memory: I wouldn't mind no onboard memory if it can lower the cost and create extra room inside the X7 to finaly have some real external memory and by that I mean BIG SD CARDS ***! Not stupid Micro-SD cards... notice how the Micro-SD is slower and much more expensive?! There is only 1 company doing 128Gb yet so that card cost 2.4x the price of a 64Gb Micro-SD card which is really outrageous. SD cards are so thin anyway that you definitely can make a dual-SD slot.
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In my opinion I shouldn't have to pay more for my DAP than my high-end headphones. I currently use (Beyerdynamic T90) which are worth 650$ though I paid 500$ and I would never pay more than 350-400$ for a very very high-end DAP. If it cost more then it's either because the company is overcharging or wasting money on marketing, useless features, etc. I only want to listen to music, it's not a cellphone damnit so skip the blutooth crap, wireless, any apps, videos, HD screen, Touch screen, blablabla... and reduce the overall price.
In fact I would even say, scrap the amp completly so we can then only pay for the DSP mainly as you gotta be dumb anyway to use a 700$ DAP with the cheap built-in amp for your 650$+ 250Ohm headphone. Anybody with a serious mind will be strapping it to a Fiio E12 so I don't want to pay for unnecessary features!