The thing is, you can order the clear coat and it solves all the issues, for an extra 6k.
I don't know if it's worse if Tesla didn't know how easy stainless steel could get fucked up, or if they knew but wanted to keep sticker price down.
Like, for them to legitimately not know, it means there was virtually no testing done. And if that wasn't tested, almost nothing else was. If they had just driven it significantly out in the real world, they'd have noticed this.