When did the Black Sea Fleet become a personnel backwater?

When did the Russian practice of sending incompetent but connected officers to the Black Sea Fleet take shape?

It appears to have emerged during Gorshkov's tenure, though no exact year or formal policy is identified.

The audience asks when the Black Sea became a dumping ground for connected but ineffective officers while other fleets acquired different reputations. The pattern is placed broadly around Gorshkov's tenure. The response does not assign an exact year or identify a formal policy. Its value is to flag personnel geography as part of institutional history while preserving that uncertainty.