True. Balance is a very important aspect. Slightly nose heavy is okay, tail heavy is not. Regarding power, opinions abound. Planes such as Phil Kraft's infamous and timeless sport plane Das Ugly Stik used the mid 1960's engines of the day, which are not as powerful as our modern day Schneurles, particularly the ball bearing ones. Flight as a real plane versus a model, well, back then one didn't have the ultimate vertical performances of the day as we do today. But not every one is into vertical acceleration. And still, these planes do fly a tad bit faster in relative turns than a real airplane even with a slightly "smaller" motor, whether speaking of Reynolds numbers or wave theory, vertical performance included.