Why do propulsive landings on large boosters test the limits of control systems?

Answer

They require precise throttle control of the main engines, flawless navigation, and coordinated terminal engine burns

Propulsive landings are demanding because they require precise throttle control of the main engines, flawless navigation updates during reentry, and perfect coordination of the terminal engine burns against a high-speed trajectory.

Why do propulsive landings on large boosters test the limits of control systems?

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