Well, imagine how will it be if we are going towards a destination and the road is straight, without any turns or without any "Crossroads".
Some of you might say "How exciting!" as you can accelerate and reach the destination quickly. And some of you will say, "How boring!". Well whats missing? The entire excitement of making wrong choices and learning the right route, the sheer beauty of watching the route to the destination while moving slowly and steadily, and above all the opportunity of gaining wisdom while undergoing this whole experience is missing if the road is straight.