Call me old school, but I like segmented housing, if only so that I can see and feel how much tension a cable is under. But also, if the cable stops are slotted, you can easily pop the cable free from the frame -- helpful when taking levers off of handlebars or working on rim brakes; you can relieve the cable tension without disengaging the cable from the caliper or lever. I'm also not a fan of the zip-tie method of securing a full-length cable housing to the frame, and those little grommets they make for that purpose are prone to failure and loss.

IMO, the only real disadvantage of segmented housing is that every cable stop provides an opportunity for dirt or water to get into the housing. Since I replace my cables whenever I replace the chain, that isn't really a problem for me.

The good news for you is that a lot of contemporary bikes have gone to using a full housing for the cable's entire length, so segmented housing may soon go the way of friction shifters!