It may not be such a bad idea for middle schools to have indoor track teams if it will get the students to exercise more which could be healthier for them and it may provide a chance for them to learn about how teamwork works and how important it is.
They're many reasons that I would say but, I will only say a few. Many people are different in many ways, more prefer this and that. Others prefer that. Indoor Track is a great sport to have since many people can bond and it will increase your endurance, confidence, stamina and self-esteem. It will has similar events to outdoor track and its safer indoors than outdoors.