I won't argue your last point. The Sexton and Garland picks gnaw at my Cavaliers fan soul because they were redundant and didn't provide an offensive centerpiece who runs the offense. However, is Haliburton that guy? SGA was a guy I liked in the late lottery, where Sexton was selected. Can we be sure a player like that who had an epxtra year of development should go top 5?
Let's look at his numbers with the USA U-19 team that features your boy Perry. Credit to an article by The Ringer: He was ninth on the team in scoring (7.9 points per game), but was first in 2-point percentage (85.0), 3-point percentage (55.0), minutes (24.7), assists (6.9), and assist-to-turnover ratio (6.9-to-1); second in steals (2.3); and fourth in blocks (0.7).
Those numbers are objectively outstanding and, as I've said, a lot like what Delly can do for a team when he is at Peak Delly. But if a team is trying to develop 3-4 players already on the roster at guard, can you justify yet another one if he isn't really looking like a Ball type of offensive centerpiece when a forward or center could be sitting there with just as much potential?
Minutes are indeed a numbers game when a team is trying to develop young players. If you don't recognize that, you are one foot deep into what made Sam Hinkie get removed forcibly from his gig in Philly.