Then "hard" does not mean "hard." Rather, you are using two completely different senses of the term.
On the one hand, there is the difficulty of a task; on the other, the likelihood of a character succeeding at it. You are, quite literally, saying that a "hard" check is somehow easy for a high-level character. What? Why on earth would you want that?
Do we then need to resort to verbal treadmill, watering down terms into meaninglessness, where what is actually difficult for a character goes from "hard" to "extreme" to "impossible"?