The problem with s/s is that not all grades offer the whole list of advantages ... Like most things in life, it's a trade off:
- s/s that can be formed/shaped with reasonable efforts, and takes that forming without developing major cracks, offers not much resistance to corrosion
- s/s that offers fantastic corrosion protection won't form well (won't bend or can't be stamped into shapes easily without cracking); these very corrosion resistant steels are very hard and "nearly brittle" (not like glass, but it does not tolerate much movement in use or deformation in production)
To make the body panels, these are stamped into shape. To do this without cracking, and more importantly not crack while in use (bouncing around streets and off-roading), the s/s has to be fairly soft, and therefore the vehicle is gonna rust fairly easily.
