E REVO chassis too much flex

I thought the chassis should be as stiff as the rocker arm before, until
I got a real E REVO composite chassis. It is too flexible, especially the front and rear chassis. I can bend it by my fingers. Front and rear bulkhead could bear more stress due to soft chassis support. It may not a big deal since no one complain about it. However, I just don't get it why the electric version vehicle does not share the same chassis material as the nitro version.