Roll cages are RC training wheels
the 6/7 new models was started because of the 1/16th chassis.
slash revo vxl x4 rally x2 ped 2wd slash vxl rus
More seriously, water-resistant has a lot of advantages, all ESCs should come "water-resistant" but for a high performance on-road car ?? I don't see why not being water-resistant would be a problem.
I can't think of someone driving a 65 - 103 mph on-road car through puddles...