I don't think Spoelstra was the problem. Their system are fine. Their defense has terrorized the league for years. On offense, they sling it around and create a lot of good shots (they also take lots of 3s).
The problems were that the Spurs:
-are younger and faster.
-are ridiculously deep. They have 7-8 no kidding two-way players that you can trust on both sides of the court. Consider that for most of the year the starters were Parker, Duncan, Splitter, Green, and Leonard. That means that Diaw, Mills, Bellinelli, and Ginobili came off the bench. That's absurd.
-have great systems on both sides of the ball.
-rarely make mistakes.
-completely adjusted to the Heat's defense.
-were shaolin monk focused during games 3-5.
It's really, really hard to beat that team. No, the problems with the Heat are that their bench has aged and Wade's falling apart.
The problems were that the Spurs:
-are younger and faster.
-are ridiculously deep. They have 7-8 no kidding two-way players that you can trust on both sides of the court. Consider that for most of the year the starters were Parker, Duncan, Splitter, Green, and Leonard. That means that Diaw, Mills, Bellinelli, and Ginobili came off the bench. That's absurd.
-have great systems on both sides of the ball.
-rarely make mistakes.
-completely adjusted to the Heat's defense.
-were shaolin monk focused during games 3-5.
It's really, really hard to beat that team. No, the problems with the Heat are that their bench has aged and Wade's falling apart.