They loose some math & reading skills, but they also get some other skills and benefits, depending how they spend the summer. Some will socialize, some will pla

They loose some math & reading skills, but they also get some other skills and benefits, depending how they spend the summer. Some will socialize, some will play sports, some will read a book or play games. And if they're at least averagely intelligent, these other skills might be more important for their future mindfulness and life, since they'll be able to pick up on math & reading anyway, it's not THAT hard after all. Also, in my own experience, forgetting and then re-learning usually leads to a much deeper understanding of the subject than what you get first time you go through it.