Why Sturdee was sent to repair the disaster after Coronel

Why was Admiral Sturdee sent to deal with Spee after Coronel?

Because his earlier planning had helped leave Cradock understrength, Fisher and Churchill sent him battlecruisers and made him correct the failure.

The answer frames the Falklands deployment as accountability as well as reinforcement. Sturdee had judged that no major threat required stronger support for Cradock, contributing to the force mismatch at Coronel. Fisher and Churchill therefore sent him powerful ships and required him to solve the problem personally. The resulting victory becomes the corrective to the strategic failure that preceded it.