Well, most marketing is all about FUD and messing things...
Some basic crossfeed isn't hard to add for game developers, but actual binaural simulation isn't that simple.
I mean wasn't BF4 supposed to be with good sound engine?
Still its headphone setting seems garbage.
So it's awfully much up to how much game developers bother with it, when already whole sound side is often such badly secondary to graphics.
And less surprisingly videos with Microsoft's Windows Sonic for Headphones weren't exactly impressive when checking them.
(what a surprise the way MS has been screwing desktop PC)
Though in Windows 10 you could pay for Dolby Atmos for Headphones.
Support from Asus is sure spotty with them giving mid finger/thumbs down for not so old Phoebus cards, while Creative still offers Win10 drivers for dozen years old Audigy 4 cards.
Just don't know why would anyone even want to use Audigy 4 which was just tweaked up Audigy 2...
But better support also for old obsolete products than no support for even newer products.
DT770 is bass heavy so old Dolby Headphone of Asus Xonars would anyway be bad fit.
Creative's binaural simulations are bass neutral so those have lot better starting point.
SB Z actually has step better D/A converter than that Fiio, though having lower voltage headphone out.
Then again that 80 ohm DT770 isn't exactly hard load with very reasonable voltage demands.
Actually despite of all hype current Fiio E10 isn't that strong headphone amp with its PR BS peak-to-peak output voltage advertising.
SBX AE-5 goes all they the way to 5+ Vrms level, which gives pretty much hearing damage in seconds level volume with about any headphone.
(Objective2 to near 7 Vrms)
) has been raised a good bit. To the bay of E's then 