Re: Oil drain bolt frozen in oil pan!
They are just borrowing more and more tech from performance circles. It's not like the pan holds any pressure. Neither does the valve train cover. Nor does the intake manifold. Speaking of which, my motorcycle has plastic valve covers. As long as leakage is not a concern due to expansion rates of the different materials, it's a good thing! I'd be more concerned about the cardboard holding the oil filter media in place than the oil pan.
For clarity sake, the pans are likely a GFRP compound. Not the same as the plastic that adorns the interior of the cabin or the engine cover.