It is impossible to make anything foolproof because fools are so ingenious. Every solution breeds new problems. To design something really well you have to get it. You have to really grok what it's all about. Most people don't take the time to do that.
All computers wait at the same speed.
Computer - A device designed to speed and automate errors. Success always occurs in private, and failure in full view. Creativity is just connecting things. Everything takes longer than you think. The two most important tools an architect has are the eraser in the drawing room and the sledge hammer on the construction site.