I don't like how crossed can make the cables stick out in between the bars and the frame entry.
Fair point, and if your frame is large enough the S-bends required probably don’t add too much cable friction, but every curve in a cable housing does add “some”. This is why in the old days with skinny steel tubes and cable stops on the lower side of the downtube, it was often the preferred method of routing for many, particularly when it came to the smaller frames. This went out of favor for quite awhile as tubes became bigger and cable bosses were more and more installed on the side of the downtube making it impossible to do the cross underneath the downtube with externally run cables. Then, as tubes became “superfat” it was apparent that you could do the cross cabling method again, except it was internally routed and you don’t even see it. I’m obsessive about having a perfectly shifting mechanical drivetrain, and so at some point I switched over and began routing the cables crossed internally. I cut the cable housing as short as possible to minimize the flaring out of cables from the downtube while maintaining as smooth a line as possible and being able to turn the bars fully either side without ripping out cables in the event of a crash or even just transporting the bike in a contorted position in the back of a car or something. The only reason I didn’t do it on my C59 earlier was because I knew there was sort of an “I-beam” sheet of thin carbon running lengthwise down the center of the downtube. I initially thought that piece ran the length of the downtube which would have prevented crossing of cables internally. But it doesn’t, it only goes a little ways down the downtube, probably to stiffen things up a bit up front. This was one of the key changes with the C60, in that they could do away with that internal piece of carbon. Anyway, the point is that piece didn’t run the length of the downtube and therefore allowed me to cross the cables internally in my C59 as well. It took a little while for me to get used to the “new look” having always taken pride to kind of “frame” the headtube badge in a perfect elipse of cable housing up front. But now, with the way I do it, I think it looks even cleaner than before and there’s no denying the cable runs are smoother, which is significantly more critical these days with 11 speed drivetrains than it was back in the days of 8 or even fewer cigs in the back. My C50 still has the double cross in front of the head tube routing due to the fact it’s externally routed and the cable bosses and downtube thickness prevent an “under the downtube” cross.