the one problem with that...
there's only one place where you can use it, and that's right at the cable hanger on the steerer tube.
That place can get very cramped as it is on a CX bike, and using a barrel adjuster on it will yield a severely kinked cable.
best solution is to use an inline adjuster, since you can use it on a relatively straight portion of the cable.
That is true, but it depends on the size of the bike. On smaller frames it can be an issue; I often forget that since my bikes are all in the 61 cm range. If the area is so cramped that you need a noodle to direct the cable, as in the photo that you need a noodle, than a barrel adjuster isn't going to work. Then again, a noodle with a built in adjuster might. If you have more wiggle room, than the barrel adjuster is the easiest solution.