A college coaches job boils down to essentially two things - develop your players and win. They're pretty intertwined but not always.
Jackson can't shoot. He came in not being able to shoot, he left not being able to shoot, and even the pro team he's on has made some adjustments but they don't really know how to solve it either. What Hurley did is put him in positions to maximize his athleticism and otherworldly bball IQ to the point where NBA teams were willing to overlook I would argue the single most important thing for a guard/wing in the modern NBA to be able to do - shoot - because of his exceptional other talents (again, highlighted by Hurley). Oh, and DH did that all while winning a national championship.
You clearly thing Ball should be a rim attacking pg. Hurley clearly sees his role right now as someone who should do that, mostly via cuts, but who also has the green light to shoot threes. This clearly benefits the team now, and will benefit the team in the future. If he's as good a shooter as DH thinks he is, getting him comfortable in low stakes games shooting 3's will pay huge dividends down the road for both his individual development and the team's.
P.S. they're calling you onanistic because you're repeating the same non sensical arguments over and over