True, but blindly trusting a computer is best left to recreational divers who can simply ascend anytime things go wrong. For other diving, multiple sources of information and the ability to verify that what they're telling you is at least in the ballpark of being correct is prudent. For example, as you point out human error is rampant - that includes human error in setting up the computer for the dive in the first place.
Guess what happens when you simply trust what it's telling you when that happens?
Your right that's why you have redundant back ups
And a solid dive plan
Sent from my SGH-I337M using Tapatalk