I'm making the wild assumption that the fork, hub, and wheel are all built for the torque of a disc brake. I could likewise claim that a 3x wheel on disc hub with disc fork but worn paper thin rim walls is unsuitable for rim brakes.

What I'm talking about is the fact that a disc brake rotor on a properly adjusted and maintained disc brake will work under just about any condition. The same simply cannot be said about rim brakes.

They ice over, they get oil from the street surface on them, they get wet... Whatever, all this severely affects braking power for rim brakes. Not so for discs.

I can't help it if you'd like to compare pathological cases.