It's not fair picking a superstar now compared to an also-ran from 4 years ago, with the ability to have 20-20 hindsight. Moreover, they're SUCH different players. And let's not forget...Giannis was picked 15th. Two picks behind Kelly Olynyk. Let's use a current, more relevant example.
Kevin Knox, Kentucky, Freshman: 15.6 points, 5.4 rebounds, 44.5% FG, 34.1% 3ptFG, 77.4% FT
Mikal Bridges, Villanova, Junior: 17.7 points, 5.3 rebounds, 51.4% FG, 43.5% 3ptFG, 85.1% FT
Who do you prefer? Bridges' stats are better. Better shooter at every range. But he's two years older than Knox. Theoretically, going by age, Knox has better upside. But if you were a GM, which one would you pick?
Yes I get that and don't disagree. It's part of the equation. But a guy being 22 wouldn't scare me off if he was good and could improve. Kevin McHale entered the NBA after his senior year and averaged 10 points and 4.4 rebounds as a 23-year old.