Good UX often starts before there is anything to make look good. The shape of the workflow, the order of decisions, and the language around them usually have more impact than the eventual layer of UI polish.
When a team jumps too quickly into screens, it often ends up decorating confusion instead of removing it. That may still produce a clean interface, but it rarely produces a clear product.
I care about the pre-screen questions because they create the conditions for the screen to work.