While this discussion has gotten astray of the original OP's question (and should be in the Workshops discussion area), cyclone performance isn't "back and white". Yes, short-cone systems are not "technically" as efficient with separation compared to long-cone designs. But they do serve a purpose when a more compact system is a physical requirement. Folks who do not have physical limitations with a long-cone design absolutely should consider them over a short-cone design but many don't actually know the differences and are often buying on price and convenience. The only wrong answer is NOT having dust collection, IMHO.
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The most expensive tool is the one you buy "cheaply" and often...