You're undervaluing Steve Kerr. Under Kerr with essentially the same roster as the season before the Warriors jumped from being an above average offense to an elite offense. The popular narrative is that David Lee was injured and Draymond Green took on Lee's role but Green was already a key player and 6th on the Warriors in minutes the year before the championship.
It's not the type of thing that is easy to measure outside of looking at team wide efficiency statistics (and thus viewing the result, not the strategy) but it seems as though Steve Kerr did an amazing coaching job. And I say this as someone who thought highly of Marc Jackson's results (it seemed like he was doing a great job coaching defense because a team that looked offensively stacked had one of the best defensive efficiency totals in the NBA). It's not a great analytics/HN narrative but what I've heard in interviews with Kerr is he made the team scale back in the complexity of their practices and work on fundamentals and avoiding turnovers.
It's not the type of thing that is easy to measure outside of looking at team wide efficiency statistics (and thus viewing the result, not the strategy) but it seems as though Steve Kerr did an amazing coaching job. And I say this as someone who thought highly of Marc Jackson's results (it seemed like he was doing a great job coaching defense because a team that looked offensively stacked had one of the best defensive efficiency totals in the NBA). It's not a great analytics/HN narrative but what I've heard in interviews with Kerr is he made the team scale back in the complexity of their practices and work on fundamentals and avoiding turnovers.