Why four quadruple turrets make a poor battleship

What is the benefit of building a battleship with four quadruple turrets?

Little by itself; the enormous gun battery drives size and vulnerability without guaranteeing useful reach or a coherent mission.

The proposal places sixteen 9.2-inch guns in four quadruple turrets on a Vanguard-sized hull. The panel sees no useful benefit because the result would be extremely large and expensive while remaining under-armed for its visibility. A ship that can be detected and engaged at capital-ship ranges needs a main battery able to answer effectively at those distances. More barrels do not solve the mismatch between the hull's cost and the limited reach and effect of the chosen calibre.