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Plans are useful until reality arrives. Then adaptation beats sticking to the plan.
From the Agile Manifesto. You can't predict what users will do, what competitors will ship, or what the market will want in a year. A plan's job is to start you moving and help you adjust — not to be executed unchanged.
"Respond to change" isn't a licence for thrash. Constant pivots exhaust teams. The point is that plans serve outcomes, not the other way round.