6. Harrison Barnes
While Harrison Barnes wasn’t traded in the same way many on this list were, the decision to leave Golden State was really made for him. When the Warriors signed Kevin Durant, the rights to Barnes were waived in order to make space for the perennial MVP candidate. And while many fans would make the transaction again in a heartbeat, it doesn’t mean it can’t also be true that the Warriors gave up on Harrison Barnes too soon as well.
Since being traded from the Golden State Warriors, Barnes has seen a sharp increase in numbers across the board, including efficiency in shooting in the midrange and from deep. The most he ever averaged in a season in Golden State was 11.7 points per game, whereas he has never dipped below 14 points per game since and usually is averaging in the 15-20 points per game range every season since leaving Golden State. Some of this is playing time, but some of it is truly becoming a more efficient player.
However, letting Barnes walk is hardly the biggest mistake that Warriors have made, as you will see in the coming selections.