I've no idea about EA3 and the strength or lack of but I recall Gil jr saying that the graphite parts are weaker than the stock stifeezel chassis material and were used to reduce weight and reduce flex in the suspension components. Which allows a more predictable handling car and lets the springs and dampers do their job while the arms do their part.
Many of the team drivers used the stock plastic chassis as it provides more grip due to the extra flex over graphite, in tha same way that many racing motorbike frames are designed to allow a certain amount of flex to improve the handling.
From the dim and distant past I'm pretty sure the AE drivers also used to replace the graphite chassis for the B3/4 with a stock version?
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