[Vlad the Impaler]

IMHO Honda should have made these components out of stainless steel or, at the very least, painted them over!

Stainless is a tall order for steering knuckles. I won't disagree that paint or powder coat would go a long way toward making them prettier, but I guarantee that the costs for that kind of esthetic would be ill received by the average consumer if Honda passed them on.
Frankly, any stainless used in that application (i.e. 446) would be ferritic and rust too.