As I mentioned, the mass scaling was lower than the 3rd power (also because the designs went from fixed to variable RPM and blade pitch, which reduces loading), so if it were lower than 2.4, that would mean larger wind turbines would use slightly lower mass per energy produced. But the main reason for large turbines is lower construction and maintenance labour per energy produced (this is especially true for offshore turbines where maintenance is very expensive).
As I mentioned, the mass scaling was lower than the 3rd power (also because the designs went from fixed to variable RPM and blade pitch, which reduces loading), so if it were lower than 2.4, that would mean larger wind turbines would use slightly lower mass per energy produced. But the main reason for large turbines is lower construction and maintenance labour per energy produced (this is especially true for offshore turbines where maintenance is very expensive).