Floor panels rust if they end up in constant contact with dampness, it's not a design flaw so much as the expected result. You should never let the floor inside

Floor panels rust if they end up in constant contact with dampness, it's not a design flaw so much as the expected result. You should never let the floor inside the car stay damp/wet. In places where salt is heavily used on roads new floor pans are something you'll see regularly completely rusted out.