I don't search out pristine water when we surf. I how ever do not like white caped water either.

As the water gets rougher the boat will bounce more, this translates into your surf wave, also as the water gets rougher you get more spray over the bow and passengers tend to complain more.

For myself, once the wind gets over 10mph we stop all water sports, when the wind is over 5 most of my wake boarders are done as well.