Question: Modern applications must save their state to disk every time the user switches away from the application. This seems inefficient, as users may switch back

Modern applications must save their state to disk every time the user switches away from the application. This seems inefficient, as users may switch back to an application many times and the application simply resumes running. Why does the operating system require applications to save their state so often rather than just giving them a chance at the point the application is actually going to be terminated?

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