Since the temp should never be near 80 C, netburst will never kick in. Besides it doesn't matter how experienced you are, if your CPU fan decides to die, say when you are away from the computer, the CPU will die if there isn't an automatic emergency mechanism. Sure, I set my BIOS to warn at 65 and to shut down at 75, but not all people have this on (it's off by default). The extra safety mechanism can save you alot of money the day your CPU fan wants to comit suicide.
...IMO