Sometimes, the display names on report prompts are confusing to the end-user. For example, on a Task Report, a prompt for "task name" just says "name" -- we need to be able to update this to make it more clear.
We cannot do this by rewriting the prompt as a custom prompt, because in doing so we lose to ability to allow the user to change the condition of that prompt. Plus, that would be a cumbersome process just to change the display name.