I remember when……
Bochurim who envisioned a career in chinuch would go to camp as counselors to get shimush in dealing with children in an informal setting. Roshei Yeshivos would encourage these bochurim to go.
What if they aren’t a good match for chinuch? Better to find out in camp at 19 than to find out is a Rebbe at 32!
To flip the question around, instead of asking “why are the conselors lousy”, ask “Why aren’t the best-of-the-best going to camp, with encouragment? There should be competition to be zoche to be mashpiah on young children.