What critical knowledge pertaining to lunar descent navigation could not be actively maintained over five decades?

Answer

Critical knowledge pertaining to the specifics of lunar descent navigation

The half-century gap between the last Soviet soft lander attempt and Luna 25 represented a period where practical application of specific, complex skills related to controlled lunar descent could not be maintained or passed down effectively through active missions. This led to a situation where the modern mission relied on newer, less battle-tested software sequences for the critical landing phase, contrasting with the deeply ingrained, practiced expertise of the original space race era engineers.

What critical knowledge pertaining to lunar descent navigation could not be actively maintained over five decades?

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