I think this discussion is beside the point.
It doesn't really matter to the uni vs sloop debate what Goran intended to achieve with the M20.
I also think that olympic sports are mainly about one thing. To be the fastest, strongest or most agile sporter of them all. Using the best or best performaning gear is part of that line of thinking. I don't see many high jumpers reach back for timber poles because that will require more skill to achieve the same results. That is not something the spectators would understand or appreciate. I think it is the same with sailing. Part of the attraction is the fact that these sailors are sailing one the most performant designs available. That must be beyond question.
With respect to :
Is their some performance aspect that is emphasized or ehnanced by the main and spin configuration in a WL course.
Basically the uni-rig is harder to sail well upwind, it is slower on a reach and on the spinnaker leg the difference is negligiable. When allowed to carry more sail area the sloop becomes faster upwind as well.
In the other aspects I don't see any significant difference.
I have to go to bad now.
