Why Crown Colony cruisers used triple turrets

Should the Crown Colony-class cruisers have been designed with three triple turrets from the start?

It could have sped construction and was a credible layout, but the design aimed to reproduce Town-class firepower; workable quadruple mounts might have led to three quadruple turrets instead.

Three triple turrets would have been a credible way to simplify the Crown Colony-class design and might have accelerated construction. The Argentine cruiser variant with a three-by-three arrangement shows that the layout was practical. Britain was trying to reproduce Town-class firepower quickly with war approaching, which helps explain the adopted battery. If the quadruple mounts proposed for Belfast and Edinburgh had worked, three quadruple turrets might have offered another route to the same firepower.