Design acceptance trials and strengthen feedback loops vigorously so that engineering can detect how to adapt the product. Keep the cost of change to a minimum to accommodate future changes.
Adjust plans to the needs of the product. Sometimes things are more predictable, and additional preparation can help roll things out smoothly. Prove it! If yes, continue, or you just talked yourselves into a fantasy with no factual basis. Base plans on observable facts, not hopes of predictability, and that the universe will stop upsetting your dreams. Work in small steps (agile), confirm what you are doing quickly, and adjust whenever necessary.
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