[nprateem]

But they're not small flaws if you're relying on it to eg replace a person's job.

If i ask it for the dimensions of a product and it gives the wrong figures it should just tell me it doesn't know instead of inventing something.

That's the problem. It doesn't tell you when something is wrong so you can never trust if it's right unless you happen to know the field. That makes it far less useful.