No, they don't. What the freshmen need is more practice. This is why Betts is redshirting. Next season we have more freshmen coming in and...hopefully... Ihnen and Fox competing for minutes along with Battle, Garcia, and Cooper. Practice is where you hone your skills. Games are where you show them off. It's no different than a band concert or a play. You get good during rehearsal, not during showtime.
There is so much in basketball you can't duplicate in practice. Practice the first 10 weeks...what you say is true. Season starts and you are load managing guys, especially depending on the schedule. How many minutes do you think the team practices in December? and in February?
I bet Battle and Garcia and Payne might be available for Ola-Joseph to practice against for 5 or 10 minutes on a good day. You are doing walk throughs, film study, blackboard discussions, shooting, stretching, weight training and rarely 5 on 5. That is not how you get better as an inexperienced player.
Sure, like your music example, you spend time on individual skills, ball handling, shooting, strength training. Two on two with the other guys who don't play. To get experience once the season starts, you need game minutes. They ain't scrimmaging 5 on 5 in December but rarely and Jan, Feb less to none. You are saving legs for the guys who play 40 minutes. So no, Ola-Joseph is not learning how to play Big Ten basketball in practice. He can improve his individual skills but that is 180 from being comfortable, confident, productive in a Big Ten game.
And I get that LOTS of coaches play 7 guys. At Minnesota we never (I suppose it is almost never)
have our best 7 guys healthy for an entire season. 2 of those 7 (or 9) didn't get through fall practice. Battle and Carrington missed weeks. You gotta play 9 now so you can play 7 IF two get hurt.
Again, just my experience from 40 years of successful coaching. Another guy, you, Ben can win only playing 7. Last year we probably didn't have the next guy up. Okay, this year we do. It's just how I'd do it, did it to win titles and fight at the top for them when we didn't. Not live on the bottom.