F the battery strap isn't securely fastened (screws), then it's not going to add a noticeable amount of stiffness. The vertical rails on either side of the battery are more key to the chassis stiffness than anything.
Why don't manufacturers do this? Because when the cars were designed most people probably still used NiMh cells. A single thin strap isn't going to hold a 6 cell pack in, but works great for hardcase LiPos.
Jon
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