I mean, I agree that the Creative products have a lot more volume potential than I've ever needed. With my 150 ohm HD700, I have windows volume set to ~24%, I actually turn up my 120 ohm AKG K612 up to ~28% because the AKG has lower sensitivity, but I'm used to my laptop, tablet, and portable music player (all Apple) being set to around 3/4 of full volume in most cases. So far I've been able to find a SPL (volume) that was fine for me, but I wish that low-gain mode would put my current volume needs at the 75% range and allow more granular control, and leave the future-proofing to high-gain mode. I had a 600 ohm Beyerdynamic DT880, didn't have the other two mentioned headphones at the time, but I only had to turn up the volume dial on my Turtle Beach DSS a little bit more compared to my 62 ohm headphones. From that experience, I conclude that ohms have a little bearing on volume but sensitivity ratings matter more, and higher ohm headphones are EASIER to amp because by the time they get enough voltage (the volume dial is turned up enough), they are also supplied plenty of current (amperes).
And maybe I will tell Creative to consider their wording about the effect of output impedance... Somebody should. "... noise distortions around you" could just as easily confuse someone to think output impedance somehow is related to active noise cancellation. That line could be the result of the translator not exactly sure how to phrase the effect, succinctly, in english. The graph in the press release does a better job explaining that, even with an extremely low impedance headphone, there is very little coloring of different sound frequencies.
I generally think of my IEM (Etymotic ER•6i, 32 ohms) as something to plug straight into my iPod when I'm on the go, even if you did get a dedicated amp for it you wouldn't need something big and powerful, just clean and low distortion. More current than voltage. The standard X7's 2.2 ohm output is already quite an engineering improvement over reference designs by Texas Instruments who manufactures the headphone amp chip, and close enough that even 16 ohm headphones should barely detect any coloration, and the vast majority of headphones will be easily Overdampening the output. Did you see how much the power supply upgrade costs? That's probably where most of the extra cost comes from, though "designing a headphone output more suitable for IEMs" is probably also a factor. That pearl white is quite attractive though!
It's one way to quickly bypass any processing. There's no "should" however, you may prefer direct mode or you might prefer a few EQ or other processing tweaks.
Been using virtual surround since before the PS4 came out, I find it more immersive than stereo when I have the option. If stereo is all you want from your PS4, there are a ton of less expensive options than the E5... Only you can decide the features list that will be a benefit you care about.
