The removable cables on the chi-fis and even the ATHM20/30/40/50/60/70 "x" could be to resolve breaking cable issues. Cable broken : NP : Just buy new.Please don't waste your money on Sennheiser CX series IEMs, they don't even last 3-4 months, my wife bought at least 10 pairs of them in various airports...all of them died ( one side)...I threw away at least 15-20 pairs of similar IEMs recently..one could buy a very decent pair of IEM with MMCX connector with the wasted money.
I've given her a T2 this time with a really thick custom cable, she's very careless with gadgets, but it's still alive.