There is too much turnover on rosters these days to rely solely on high school players. You're going to be constantly in a situation where you're going to need to plug in gaps with physically mature guys that can contribute at a high level immediately especially with a 13 man scholarship limit rather than 15 from 30 years ago. You need to do what it takes to win games. Win some games and talented high schoolers with the ability to contribute right away will be more willing to sign up in the future. Winning matters. If having some Jucos helps you, you do it.