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The dispose() method of ApplicationAdapter is not invoked upon app destruction because it is not explicitly called by the libGDX framework. Instead, it is the responsibility of the developer to manually call the dispose() method on any disposable resources when they are no longer needed. This is done to ensure that the resources are properly disposed of and to prevent memory leaks. Therefore, it is essential for the developer to keep track of all disposable resources and call their dispose() methods as needed.