You're right, it can be taken too far. But for every kid harmed by being pushed too hard, I bet there are 10 harmed by not being pushed at all.
Right. We have too many kids who expect learning to be fun. Hell. I'll tell my child if he finds learning fun, it'll be a coincidence. The learning has to happen, fun or not. But not to the point of being miserable. There should be balance.