Nobody wants to play a game, where u win, before u start, the challenges makes it more exciting
Or, if the world wasn't designed, is it a perfect "design"?
The world is perfect in its imperfection. Like Jelly Toast said, without challenges and uncertainties life would be so boring, If the uncertainty is designed, then i would call it a perfect design.
Even if it was designed, I don't think it's perfect at all. If I were God, i'd make a universe where Log and Ln functions weren't an inherent part of the universe.
In my personal opinion, if this world was designed by something, it was probably some 3rd grader's science project that they got a C- on.