I would rather have extra power rather than juat enough even on a trainer. When someone makes the effort to make it out and try to get some training, wedon't want to say no just because it might be windy. If its in the afternoon the winds can suddenly double in speed and then the extra inch of prop or higher rpm available really helps to get the plane back down in 1 piece. The extra power can also be used to teach that you can fly with more than just 2 throttle positions!