That's completely wrong. It's not better than what you had because you are relying on something with false confidence and running larger positions than you would have otherwise. You're worse off relying on misleading information than on not having any information at all. If you give a pilot an altimeter that is sometimes defective he will crash the plane. Give him nothing and he will look out the window.
Technology is only safe if it is flawless.
A lot of people reduce their anxiety when they see numbers. They want a triple-digit delta or gamma, for example, not taking into account that it is foolish to be precise with deltas when you don't even know the parameters. Before VAR, we looked at positions and understood them using what I call a nonparametric method. After VAR, all we see is numbers, numbers that depend on strong assumptions. I'd much rather see the details of the position itself rather than some numbers that are supposed to reflect its risks.