Aren't all the subframe and suspension bolts steel with a special electro-something coating on them to prevent the aluminum to steel chemical reaction?
Exhaust, bolts, head bolts and nuts, oil pan, etc... all are steel. Its a car, so I drive it. Some people baby theirs, others drive it, do as you please but yes its fine and the car won't melt. However salted roads for snow control is probably the worst for your car.
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Honda coats these steel bolts in dacro to isolate them from the aluminum. The NSX body was designed in such a way that it does not collect water is seams and crests, in a way that would promote rust. So, the NSX is ready for the rain all day long. 27 stage paint job helps too.