This may not be fair, but I feel like the Celtics seem to have the approach that they have identified a perspective that the best strategy in any given situation X is Y, and that regardless of how that is playing out in a game, they will stick with Y. For example, deciding to play Butler one on one instead of double teaming him. I think there can be some merit to that approach. If you have decided that, based on a significant sample of evidence, that a particular strategy is the right one, it's not necessarily smart to go away from that strategy just because somebody hits a couple of shots in a row.
That said, this seems to ignore two factors:
1) It's very possible that the pre-defined strategy could be incorrect for a given game situation, given how players are performing on a given night. So, sticking with the pre-defined strategy too long is ignoring real time information.
2) The Celtics don't really seem to use the strategy of trying different things during a game, in an apriori way. As we've seen against the Celtics, many teams do different things against us. Double, don't double, etc. NBA players are really, really good. If you keep doing the same thing against them, they can't beat it. Keeping your opponent off-balance seems like it should be a key component of the strategy. I could be completely wrong here - but I don't feel like the Celtics do that.