@Tommy_Taylor_1972 By dumb I don't mean effort plays that go awry, I mean stuff like:
a. Throwing a wild, nearly length of court pass to another player that's 1 on 3 resulting in a turnover as it sailed out of bounds. Had the pass even been successful, it would have had zero positive benefit as the intended player was outnumbered
b. Not this game but throwing a pass at the back of another players head when he had no chance of seeing it had even been thrown
c. Another member posted the setting of a pick by throwing your elbow out right after it had just been called against the other team
There's others, but I'm mainly referring to what I characterize as mental errors. You also cited great points about the lack of reinforced basic skills resulting in higher percentages of screw ups. That is all coaching in my opinion but you can argue instilling discipline, training the team to be mentally tough is also coaching.