Melodeath
Moonbow
There's a debatable aspect of higher frequencies being inaudible but still affecting the audible spectrum as pointed by Rupert Neve years ago... Just saying...
But yeah, probably more of a marketing trick in this case. It doesn't make these better or worse and new isn't always better.
Pretty interested in having the hs-7 as a secondary setup depending on the price though.
Yeah, if the extra high frequencies cause distortion in a transformer or speaker, or whatever you're using and these artifacts are in the audible range, sure it's obviously audible. But there is currently not really any debate about the limits of human hearing, except within the hi-fi/gearslut/pseudo-science/etc. community.