The main benefit of hurricanes is that the ecosystem is cleared and the wastes are flushed out. Another benefit that a hurricane can provide is that it can provide enough water so that people will not experience drought immediately when it occurs. The trees that are already established will have more space available in order to grow. The weaker ones will die but there may be new stronger trees that will take their place.
The stronger the trees are, the bigger the possible defenses available against hurricanes and other possible natural disasters. There are also some harmful organisms that may perish during the hurricane that is not needed in the ecosystem.