My S is on his school’s debate team. I think it is a worthwhile EC. It has given him tons of self-confidence for public speaking and organizing arguments. He has bonded with his team and enjoys going to other HS’s to compete. It is by no means his only EC. He is also in Science Olympiad, among other things this year. I say if he enjoys it, let him participate. If not, he can drop it and find something else to do.