no.

Has to do with angles of attack at which the sails need to operate. It sounds contradictionary but the furher away you are from a beam reach the more the angle of attack decreases at which the sails need to operate. This is also true for downwind legs. At the boat speeds we are talking about, angle of attack issues are significant and most probably the single biggest limiting factor in achieving higher speeds.

Envision it this way. You can't fly the spinnaker on the upwind legs BECAUSE of the angle of attack being to small on these courses. The soft sail won't keep its shape. Similar things also happen to jib and even mainsails although the mainsail can operate at the smallest angle of attacks of all three sails. Typically around 20-25 degrees.

Wouter