Back in the Losi XX and XXX days we were running with no way near the power the brushless systems give these days.
More power changes whole handling physics, especially on an offroad vehicle so weight is needed to counter act the changes.
Back in the XX XXX days in UK we were mainly racing on grass too, which has a lot larger drag factor on transmissions and speed compared to modern day astro tracks with lots more grip.
You can design the perfect balanced chassis for rollcentre and C of G but if the front wheels are in the air everytime you hit the throttle then it won't make a difference to handling unless wheels are firmly on ground!
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