And I'm guessing overflow tubes lead to claims being paid out. We're living in a very litigious society. The EPA excuse makes a good cover story for manufacturers
The thing of it is, without Overflow tubes, you would still be quite likely to leak gasoline. If the intake valve is closed on the cylinder that's leaking, it will simply leak out the airbox. If the valve is open, it will leak through to the engine oil and may or may not leak out the airbox, depending on the severity of the leak. It's not like the gasoline just sits there cuz you don't have overflow tubes. It will leak on the ground, quickly or eventually. It's that gravity thing.
The tubes just let you know before you hit the starter button that you have a defect, or more likely, a minimum of two defects.
Yeehaw!