Problem is that a lot of those 4 and 5 star guys Duke and UNC have gotten don't stay in college for more than a year.
UNC hit a home run with Coby White and he was a one-and-done. Nassir Little was just a guy and left after a year (though they were a 1 seed in 2019). Leaky Black was a 4 star in that class and to this point is a nice defensive player but a horrendous shooter on the wing. Not sure if you blame the coach, the ranking system or the player on his lack of development.
Anthony was a one-and-done guy. Bacot, another 5 star is a solid piece but not special. Anthony Harris, a 4 star has barely played due to injuries.
And now this year they've got a 5 star PG in Caleb Love who is shooting 25 percent from the FIELD and less than 15 percent from the 3-point line. Again, I don't know, do you blame the coach for a 5 star who shoots 15 percent from the 3-point line? That's complicated to me. Their roster balance isn't great.
Duke is in a similar boat. Zion, Reddish and Barrett were the guys in 2018 - all one-and-dones. Tre Jones only stayed two years. Vernon Carey was a one-and-done. Cassius Stanley was a one-and-done despite not being all that good. And now their highly rated freshman class looks just kinda blah. They haven't gotten much development from Baker, O'Connell (before transferring) and some other non one-and-dones. Do you blame coach, the players or the rankings?
Certainly won't shed tears for Duke, UNC (though I'm a fan and it's annoying that they've been so mediocre/bad the last couple years), Kentucky etc but it's hard to sustain a program at those schools nowadays because the culture of college basketball is to get out as fast as possible. Perhaps it was always this way, but it feels like more than ever, kids are going with the sole purpose of getting out and getting to the pros (NBA, Europe, GLeague or whatever) and it's actually hurting some of the blue bloods because while they get highly rated kids to commit, you don't get to see those guys come even close to their ceilings in college because they leave after a year.