That’s funny since when I ordered a Beyerdynamic headphone on Amazon they sent me the high impedance model I hadn’t asked for.

Although the best one I own is a Stax which needs an entire speaker amp.

Wait, aren't Stax the electrostatic high-voltage headphones? I think at that point, "Convenience" is deeply crossed out as a selection criteria, and a portable phone while jogging is not a likely scenario :).

They actually made IEMs once. Beyond the technology being hard to manufacture, Stax's products are mainly just inaccessible because they have the traditional Japanese business approach of being run by 800 year olds who are actively offended by the idea that anyone they don't know might want one of their products.

their portable 'phones are fantastic, but yes, their full size tube amp is taking an inordinate amount of space on my desktop

https://www.headfonia.com/baby-stax/