Nothing, if you know exactly what you're doing. But it's not very good about explaining why e.g. throwing error messages is bad. It's sort of like a toolbox f

Nothing, if you know exactly what you're doing. But it's not very good about explaining why e.g. throwing error messages is bad. It's sort of like a toolbox full of really sharp, pointy things with the implicit understanding that sticking your hand in blindly will hurt, and then being surprised when there's a rash of hand injuries.