True your quite right there is no system that man can make that's 100% random. The fact that the ping pong balls and the rolling machine are made at the factory excludes any system expected to have true 100% randomness, however, the mechanical way of drawing the ball has the balls colliding against one another and against the rolling machine's chambers, and you get to see it live on TV and record it. Such collisions make the game more random than a digital draw!!! Also, there is an inherent bias naturally that goes into the rolling of the ball and those collisions. You can take advantage of this bias!! On the other hand where do you find collisions in an electronic RNG. I don't know, but i think there is none. Maybe, but maybe its why they want to change the lottery to make them less random, maybe they have too much faith in making everything go digital, and lottery officials don't know any better. Personally, i believe there's more randomness in the old (mechanical) system. And, perhaps i can't prove it, but Physics Professors can.
Best Regards