It should go without saying that fewer bugs is better than more bugs, though. I'm not saying you should never rewrite a system from scratch. But I do think it

It should go without saying that fewer bugs is better than more bugs, though. I'm not saying you should never rewrite a system from scratch. But I do think it's extremely costly to do so, and that it's extremely difficult to predict when you'll be driven out of business if you don't. So I don't think it's usually justifiable. I'd be very interested if someone could supply an example of a company that was put out of business because they failed to re-write their product.