Another interesting factor is the risk/reward of drafting players from high school as opposed to players from the college ranks.
There is only about a 14% chance that any first round high school drafted pitcher makes it to the major leagues, and less than 8% chance that they will play 3 or more years.
For first round college drafted pitchers, those same numbers are 22% and 15%.
Both Hall and Rodriguez were high school picks.
Gibson, Kremer, Bradish, Irvin, and Wells were all drafted from college.
https://sabr.org/journal/article/the-chances-of-a-drafted-baseball-player-making-the-major-leagues-a-quantitative-study/