Well, then there are playlists:
1 - Manage of dynamic playlists, decide "play next", "play last"... like Calyx.
2 - Being able to change order of the songs inside a playlist by just draging/sliding a song within the list (of the playlist). Again... like Calyx.
And ...take advantage of the gorgeous & Bigger OLED screen. Today It is wasted to just show tabs and menus.... like the AK100/120 !
And on the hardware side... again (sorry): having a real line-out that does not go through the Headphone amp, and therefor that cannot be colored by the headphone amp. Some sort of SS relay needed.
Being able to manipulate the playlist would be good - I can see that being useful. This sounds like something that could be added in a firmware update, too. I wouldn't worry about the album covers, though. How long do you look at an album cover? For me, I see it and go, "yup, there it is" and it's back in my pocket. I don't know about the hardware end of things - if it doesn't have a real line-out, I can see that bothering some folks for sure. What do you expect for $2500+?