For those wondering, hitch shanks don’t “rust in” in a few weeks or even a few months, even in the salt belt. And if they are trying to they make this stuff called grease, fluid film, antiseize for that purpose.
However locking hitch pins won’t make it through a wet winter, much less a snowy salty winter without freezing up. Just basic maintenance, keep ‘em loobed up.
Personally living or driving anywhere in suburban or urban areas, I’d not forego the free tale gator protection of a trailer hitch shank if driving any vehicle with a hitch receiver.