I utterly hate the under the bottom bracket routing of exposed cables. Basically you subject them to operate in the state of pushing against sand paper. It has been the location for me where troubles with cables started. When deciding that I will not tolerate what the bike companies impose on me, I first put the cables in full length housing expecting, what the folklore was saying, that the shifting will get worse and brakes will get harder to operate. The shock was that there was absolutely no difference when I switched to full length housing, maybe it got a tad better. Now, these days I go with linked housing and it is a revolution. A complicated long routing with sharp turns works about as well a short run of a cable.