I agree, and this has been my argument against the one-and-done phenomenon in college basketball.
Showing my age, I'll use the example of Mark Price and John Salley; they were not highly touted recruits when they arrived on campus, but four years later, they came within one off night by Price of cutting down the nets. But that took time to develop.
Contrast that with one of the most notable one-and-done players in recent ACC memory, Zion Williamson, who was a great individual player, but Duke failed to get to the Final Four. While Duke fans remember Zion positively, he's not held in the same regard as Johnny Dawkins or Christian Laettner who played four years in Durham.
So, I agree with your analysis, but we'll have to wait a few months to see how this plays out at UNC. FWIW, I've long believed Carolina is a sleeping giant in CFB, and if they EVER get things going in the right direction, they could EASILY be on par with UGA and Ohio State, etc. North Carolina is one of the top states for high school talent, and UNC is the flagship program in the university system.