(Lack of) Coaching as an inefficiency is a good point but Kerr who is a positive example in the video was also the US head coach at the FIBA WC and Spo an assistant.
I think another aspect of the benefit of longevity is the reduced player movement of a team's core players.
Dirk really wanted to master the skyhook but rarely felt comfortable to use it because it probably wasn't efficient enough by him. He must feels double impressed because of that.