This a friendly reminder that there's a lot of horrible external cable routing, too. I've had noisy and rattly hoses and housing, I've had a rock chop my downtube-routed external brakeline in half on a road trip ($70 for a replacement Shimano hose from an LBS, ouch), I've had crazy rubbing and paint wear from cables, I've had below the BB routing (booooo), I've had a bird's nest of cables at the headtube, and I've had 10 foot long derailleur housing because the cable is seemingly routed on every tube of the frame before it arrives at the rear derailleur...