in my team there are a some sailors that just started sailing and i'm sure that they wouldn't go out without a coach because they aren't very experienced and don't feel comfortable sailing alone!
If sailors are really using coaches because they are not experienced enough to sail alone, then, as I have previously suggested, perhaps we should divide the scoring for the regatta into two groups: a coached fleet (the "Trainee Fleet") and an independent group (the "Yachtsman Fleet").
Coaching is a great resource for training. But, when coaches are on the water during a regatta, they are typically providing support in the form of food, water, shelter, and advice. This support is not primarily designed to coach sailors to make them into better competitors. Rather, it is designed solely to make the regatta easier for them.