See the link I just posted.The majority of the best players in Basketball aren't sticking around more than 1-2 years. Most of the Blue Bloods are chasing the Mcdonalds all American. Most of the teams that win championships get top level talent or the players that develop into top level Talent. You can get some good support players but you're not going to find a championship team through the portal. The only way the guys we brought in would have helped us win a championship is if we had the pieces to build around. Which we didn't.
I don't disagree with the notion most top level HS players don't stick around in college. Hell, many don't even go to college anymore. But your exclusive comment is very flawed in an attempt to make a point.