Nothing works without psychological safety.<p>The difference is that if you plan work in one year increments you might be able to avoid conflict for 9 months to a year. If you're a really good avoider you might even be able to get some work done.<p>With agile you're certain to have an argument, butterflies in your stomach and other unpleasantness in every sprint -- and you'll be blaming your process for your problems whereas with a lack of process you'll blame something other than your process.