I have to agree with the comments people are making.
I remember as an apprentice back in the 1970s, when I was even younger than I am now, we had the discussion about this topic at night school.
It was the opinion of the lecturer, that the lack of corrosion prevention was a deliberate ploy by motor industry to keep sales going.
That was with technology available then.
We can all remember how the cars rusted back then. It wasn't just British Leyland, it was European, American and those from the Far East (only available in a Japanese flavour back then). But Volvo, for example, managed it.
It seems a shame that, despite the technology available today, we seem to be reverting back to those days.
But, there again, there has been a lot of advances in aerodynamics, but people prefer to drive around in bricks.
I am surprised that I can remember anything from night school, as at the Friday night one, my mind was on other things.