My guess is TRUST. Football coaches are notorious for needing a feel comfortable with trust levels

of young players before they get a chance on Saturdays.

I think back to LSU a few years ago who lost the opener because a 5* freshman (Malik Nabers) muffed two punts resulting in points for the opponents. Those mistakes basically lost LSU (and BK) the game and eventually the season.

One of the reasons Matt Salerno returned punts (and would mostly just fair-catch), because the coaches trusted he wouldn't make a mistake that cost the team.