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Full outers are very common on MTBs and CX bikes. Every break in the outer is another point for water and dirt ingress. I am a huge fan of full length outer cable and have drilled end stops before to facilitate it. Without a full outer, I had to recable my CX bikes twice a season, with a full outer the gear changes stay good for at least two seasons!
leggy_blonde
You only need cable housing for taking a cable around bends.
Adding housing on a straight run (down the frame) will just add weight, friction, trap dirt and would be pretty unusual.