Two things come to mind...
1. For those who want to sell the car in the future, the next owner will likely has some questions for all these "snakes" running around on top of the engine. You will need to explain it to him/her.
2. The E23 (1983-1987 735i) Intake Manifold sits ABOVE the engine.
So the CCV system in that car is simply a tube going upward, see photo for #11 in E23:
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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT
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