[EricH]

The teams I work with are pretty small. 330 typically has around 10 students, of whom 3 are on drive and the rest are scouting. Mentors also scout during breaks.

1135 is simply carrying over from FTC. They choose to have a student on the field as coach. While a relatively small team, they are pretty much all student-run. So having a student coach is a logical continuation.

I'm with SL8. Having an adult coach is not having an adult do it for you. On a good drive team, it's having an adult do it with you.