There's a bit of a difference, though. Blade and Storm were specifically written as black characters in a mostly-white cast, and that was important to the way they were written. Many characters really aren't written specifically as white; they're drawn as white because they happen to be in a country where most people looked like that.
There are some characters who have to be white, like Steve Rogers, and then there are other characters who would be exactly the same if you changed their skin color.