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It's great to see more examples of this!
My thought as to why BMW chose to use that type of hose for the ventilation system is to catch oil. The numerous ripples in the stock hose creates turbulence and more surface to capture oil. It could be a "win-win" if you can find a similar type of hose to connect to the oil catch can. Personally I think that would be over-kill but if someone is looking to over-engineer, it could help.
Also keep in mind the size of hose being. Gasses would travel faster with hose with a smaller ID and slower with a larger ID. These are adjustments you can make if you feel the oil catch-can is loosing efficiency.
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