Been watching a few vids lately and it's easy to see the top of sails twisting off appropriately. But it also seems like the entire leech is doing absolutely nothing most of the time, except perhaps causing a bit of drag and adding weight.

Is there any logic to removing floppy leeches for certain types of sails?

Surf sails for example still find the extra grunt up high useful, but perhaps a speed sail does not need a floppy leech at all.

Just wonderin'.