My first experience with expensive, non-ergonomic IEM cables was Tralucent Audio's uBer v1 cable that had a solid core (which I still have for sale, BTW). For the 1Plus2 and Ref1.Too IEMs they were paired with, there was a noticeable decrease in sibilance, especially with the 1Plus2s.
Anyhow, I mention this, because the cable was a liability to use as it was solid cores (no kinking, put it up very carefully, etc.) and it was microphonic (all as previously stated by other people), so when it came back to a cable like the 19 that was thicker, but not as fragile, it wasn't a big deal for me. It's a matter of perspective, however.
Like I say, I wouldn't wear it exercising or running and if I were to do so, I'd probably just use a much cheaper IEM/cable combo for that activity anyhow.