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I would strongly disagree with this.

I raced the Mac on a boat with a Code Zero or basically a roller furling headsail that was designed for downind sailing, a hooter.

We were severely handicapped in dead down situations. We used every technique and angle that we could think of and were getting crushed by smaller boats (multis) that could sail lower angles and carry the apparent wind lower. We also gave up alot of distance and angle to leaners (monohulls) who would just put up a cloud of a spin pull the pole back and go nearly DFW.

The sail did have its window & conditions, but for pure downwind sailing I I would not want it as my ONLY option.