I don't recall anything particularly good about road draft tubes, they were messy and an environmental disaster. The drawing also shows a downdraft carburetor, and pushrods. Those weren't so good either. All in all, modern engines are amazing. The only reason we are even talking about the modern version of PCV valves is that we don't have to talk about ring jobs, lapping in valves, bad floats or needle valves in carburetors, or valve adjustments.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue