Trivia: When he was cast as Ivan Ooze, Paul Freeman admitted he had never heard of the Power Rangers before.
Trivia: The reason why Billy did not wear glasses in the film is because he simply just asked not to due to the fake lenses hurting the actor's eyes.
Answer: There's never a "point" to including a weakspot, by definition they are a flaw in the design that is either unforeseen or unavoidable. Maybe they could not find a way round it when building the robot, or any solutions simply created other weakspots.