When you’re building digital products speed is a critical. Developers and designers need to practice getting their work done quickly and iterating toward perfection. There’s little doubt that speed helps you ship quickly, limit your technical debt and generally is preferable to large slow cycles.
At a certain speed you’re airborne. You’re flying, but it’s harder to adjust course because you’re no longer touching the ground. At these speeds you want to ensure that your trajectory before lift-off is toward a place you want to land.