The main thing I can't stand about many sealed in-ear headphones is that lightly jostling the wire causes a massive bass thump in my ear. Regardless of fit, effectively this means I can't move at all while listening to them. The effect is so loud that I marvel that anybody can ignore it.
This phenomenon is called “microphonics”. It can he mitigated by wrapping the cable around your ear from the top. Indeed, this is how professional in-ear monitors are worn (e.g. Shure).
https://en.wikipedia.org/wiki/Microphonics
> Microphonics, microphony, or microphonism[1][2][3] describes the phenomenon wherein certain components in electronic devices transform mechanical vibrations into an undesired electrical signal (noise).
There's no electricity involved in this phenomenon, which arises through pure mechanical coupling when the wire causes the sealed earpiece to move and air pressure in the ear canal to swing wildly.
But that's like complaining about URL vs. URI...