As Hemingway wrote: "Time is the least thing we have of."
I do appreciate you taking the time to write up that reply. I don't have time to devote to putting together the perfect digital music rig or to building custom computers not that those things are not valid uses of time. Everything is valid. I write software for a living. When I'm not doing that, I study the classical guitar. There are no SD cards in the thing, and no worries about obsolescence.
I'm not looking to get into a religious debate about Apple versus anything else. I've used many different types of computers over the years, starting with a PDP-11 and DecWriter terminals, paper output, programming in LISP. All computers are flawed, LOL. I'm intrigued by the new Surface Studio with its 28" display, mainly because of the huge touchscreen, and because of StaffPad, which is the most amazing musical input software I have ever used. StaffPad turns my music scrawl into beautiful notation and plays it back to me. I run StaffPad on a little Surface Pro 4 and it's great.
I did look through the X7 system and it does seem intriguing, with all of its different add-on modules and docking station, but the 32GB base memory and one card slot seems like a non-starter to me. I'll never get around to swapping SD cards, and I'll probably lose the second card, LOL. Most of the newer AK models have only one slot and 128GB base, which has people complaining to no end.
The AK240 has 256GB of memory and one slot and I can run a balanced line out to my preamplifier but it's a pretty fragile connection so I worry about that. The new 300 series have a better docking station but back to 128GB memory and one slot on all the models. Just leave off the 380, I'm not dropping three grand, LOL, but even that thing is 256GB with one slot!
No, I don't base performance on price alone but there is a correlation between price and performance. There must be some other solutions besides the X7 or AK models for $1500 or less. I loved the Chord MojoPoly setup because you can use your phone's screen for everything but no line out, wireless streaming only, AFAIK. I spent years putting together my two channel system at home snd I prefer it to any headphones. But, when I travel, it would be nice to have an excellent DAP with all my music to take along.
Has Sony not built a decent offering in this category that gives me what I want? No, I don't want the gold one.
It seems simple.
I want a DAP with two card slots which has line out for my stereo. I don't want to build a music server on a Mac Mini. The fewer servers I have to maintain, the better. I want a portable rig with all of my music but I want it to effortlessly plug into my two channel system at home.
P.S. Steve Jobs ripped off Alan Kay and his brilliant work at Xerox PARC when he was shown a demo of Alan's Smalltalk-based windowing system. Of course, Steve did not understand the software behind the windowing system so he just ripped off the windowing system. Steve admitted as much in a New York Times article a few years ago. I've never been that big a fan of Steve Jobs but he did lead Apple in building some beautiful computers, even if you do hate them, haha!