In terms of major professional sports. Footballers and NHL Hockey players are not well rounded due to lack of education in my opinion. It's basically high school education at the most for those in football academies and hockey players, in my opinion.
NFL - All come out of university programs some completing a full 4 years.
NBA- All come out of university programs some completing a full 4 years.
MLB- All come out of university programs however # of them completing 4 years is much lower.
I know the football academies have put a focus on education more in the last 10 years, but still lower when compared to other professional sports.
University/college gives the player some real world experience. Seems like a lot of footballers and hockey players don't have that. I've never heard of a footballer being dropped by an academy due to poor educational performance. NFL and NBA players even top ones who don't meet education requirements can and have been dropped by university programs.