And in support of Jan, I've got another reason. Far too many beginners learn on overpowered planes. This allows them to build bad habits such as 10 foot takeoff runs and 45 degree climb outs. The result is a bunch of people who have no idea how to make their plane fly in a manner that at all approaches a full scale plane. I'm not saying people shouldn't perform extreme things with their planes, I just think it's sad that some people never learned anything but extreme. I've heard the argument of having the extra power to help get out of trouble. Instructors would do better to teach students to not get in such trouble in the first place. This would put them in a better position for flying other planes. Students would do better flying mild mannered trainers and developing good habits before progressing to overpowered planes.