The strategy for acquiring and using goalies varies a lot across the NHL.
Perhaps strategy is too grandiose a term. There is some evidence that some teams just accidentally land where they are with their goaltenders. While luck is part of hockey, counting on it as your only strategy seems foolish, but we can hardly fault someone for having good luck instead of bad, and we shouldn't fault them for bad instead of good either.
Was it luck or planning that Marc-André Fleury was still on the Penguins for the playoffs, and was lights out when he needed to be?