I don't think the Dbacks strategy was any secret. We could all see it in Game 6. But they'd already taken a 3-2 lead in the series by then, and neither players nor coaches can just adjust on a dime. And sometimes when you're not seeing the ball you're not seeing the ball. It wasn't just strategy, it was execution. DBacks made plenty of mistakes that led to the Phillies winning the games they did. And then they didn't. Plus we wouldn't be talking about this at all if not for Kimbrel.
For sure, adding (or returning) one more disciplined bat to the line-up makes sense. But actually moving on from Nick is easier said than done, and we also don't know if the Rhys you are bringing back is still going to be the Rhys that used to put up a .350 OBP (or an .850 OPS). Whatever they do/whoever they get it should be that kind of hitter though.
And maybe Long should think about his approach. But you can't say his approach didn't work just because they lost to the Diamondbacks. It was a great offense and one of the best Phillies teams we've seen this century (probably #2 after 2011. But only #3 or 4 in terms of post-season success).
They got out-managed and out-played in the end, no way to sugarcoat that.