It's not the heavy topspin that's the problem, it's the loopy shots. If the other kid hit heavy topspin balls with a flatter trajectory he would be more consistent than the other kid and hit just as penetrating shots.
Topspin =/= loopy. Look at Federer, he gets the 2nd most amount of RPMs on the tour and he's not just hitting loopers. Once you start trying to hit through the court with a lot of pace, you NEED the topspin to keep it in.