Why early dreadnoughts retained wing turrets

Why did staggered wing turrets persist during the transition to centerline superfiring layouts?

They evolved from proven earlier layouts and eased some machinery and internal-space constraints, but became inefficient once workable superfiring arrangements were available.

Staggered wing turrets can be understood as a step away from hexagonal layouts rather than simple incompetence. Early sighting arrangements and the internal space freed by deleting two wing turrets help explain the transition. Dreadnought-era navies were still paying for guns they could not use efficiently on a broadside, however. End-on fire could also impose structural strain on the hull even where the firing arc looked useful. These layouts combined structural and operational tradeoffs while workable superfiring arrangements were still emerging.