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Why not use ScheduledExecutorService?

Why not just use ScheduledExecutorService instead?
e.g.

public class DeferredCallbackRunner {
    private ScheduledExecutorService executorService = Executors.newScheduledThreadPool(1);

    public void register(Duration duration, Runnable task) {
        executorService.schedule(task, duration.toMillis(), TimeUnit.MILLISECONDS);
    }
}