And what is the point of then fitting larger diameter disks to make the brakes even more powerful and likely to send you over the handlebars?
I'll tell you: ride a loaded touring tandem with a trailer. You need the extra metal to soak up the heat.
True, but increasing the diameter of the disk also increases the leverage working against the rotation of the wheel and so increases the chance of lockout when unladen. A better solution would be to use vented disks of a smaller diameter. These are effectively two side by side disks joined together. They have vent holes to help the heat escape from inside the gap.
My 1983 Cleland Aventura shown below has hollow brake drums that allow the heat to escape through the entire hub. A system that works well when towing a heavily laden trailer.
9/16" Suntour BMX MP-1000 pedals / 56 tooth TA 6-bolt chainring.(I'm not bothered if the teeth are worn or damaged)