There are plenty of nice headphones with low impedance among grado, sennheiser, beyerdynamic etc, you kinda have to go out of your way to choose a high impedance “home stereo” style ‘phone
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.
