Why does the failure of auxiliary components in a liquid engine often lead to total mission failure?

Answer

The failure of a single component like a seal or bearing in the complex mechanical system can cause total failure, a scenario solid motors avoid by design.

Liquid engines rely on many interconnected, precision-engineered moving parts (like pumps and bearings) to function; the failure of any one of these systems compromises the entire feed mechanism.

Why does the failure of auxiliary components in a liquid engine often lead to total mission failure?
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