Sure, not every body has a full complement bike tool chest and most have no idea such tools even exist. Its strictly bike-nerd stuff. I have done my own repairs for decades, literally, but I too find internal cabling a faff. Some bikes worse than others. I just converted a drop bar bike from from mech to hydro disc. Man! it took some ingenuity and patience getting both the gear cables and (plastic) brake hoses routed in a frame with no internal guides, tight bends and tiny little holes for the gear cables under the crank. My other bike, with external cabling would have been done in less than 1/2 the time.