The idea of using watchdog timers work very well since those are usually accessed directly (just map the memory over PCI or whatever bus you have). Those timers start the countdown once they set an initial value and then you have to set them all along the life cycle. One have to estimate the time till next refresh and hope the timer had such long intervals ... It is useless in general purpose system since you don't have and fixed periodic task. Yes, the ticks ISR is but what it does not indicate any soundness of your application (nor OS) so adding it to such procedure will keep you from immediate reset but will not save you in case of severe failure.
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