End plate effect is accepted dogma for deck sweeping jibs.

To take it one step further. Why doesnt cruisers have deck sweeping jibs? Well, some do, but most of them retrofit roller furling, and recessing the furling drum is a major job. Newer cruisers sometimes have the furling drum recessed, but usually only in the higher price range. Another major problem with deck sweeping jibs in cruisers is lack of visibility, and building lasting opaque sails for cruisers is hard/expensive.