There's nothing wrong with taking a break at all. My kid takes 2 days off a week but that's more physical than mental. Ask any serious junior tennis player if they want to take a mental break over the Winter months. There's your evidence. The majority like to compete.
Now the parents might need a break but I don't think the serious junior will unless the parents force the child to play. I do think many parents need a mental break and in some instances professional guidance.
I don't know too many kids that enjoy final exams. Given the choice, my kid would prefer to take a mental break from school but tennis and competitions are enjoyable and a release.