The real wisdom here isn't that plans become obsolete—that's the easy take—but that *the act of thinking through contingencies* rewires your brain to handle surprises. When Eisenhower planned D-Day, no battle unfolded as written; what mattered was that his staff had wrestled with a thousand "what ifs," so when reality diverged (and it always does), they could improvise from a position of knowledge rather than panic. A parent packing for a cross-country road trip with small children learns this: the detailed itinerary gets abandoned by mile two, but the mental exercise of imagining breakdowns, meltdowns, and detours means you've already solved half your problems before they arrive.