I can’t think of an application where a nail is better. Sure, sometimes a nail will do and there’s no need to use a screw, but that doesn’t make the nail better, just cheaper.

Screws genuinely are better fasteners than nails, though…

Because that’s what intelligence is. There’s a very funny video floating around of a squirrel repeatedly trying to bury an acorn in a dog’s fur and completely failing to understand why it’s not working. Now sure, a squirrel is not the smartest animal in the world, but it does have some intelligence, and yet there it is just mindlessly reproducing a pattern in the wrong context. Maybe you’re thinking that humans aren’t like that, that we make decisions by actually think through our actions and their consequences instead of just repeating learned patterns. I put it to you that if that were the case, we wouldn’t still be dealing with the same problems that have been plaguing us for millennia.

Technically yes, but in practice any gains are going to be counteracted if not outweighed by the electromagnetic noise from the fan’s motor. To avoid that interference and see any real improvement in your signal strength, you’d have to either use a fan with a shielded motor (the last such model went out of production in 1953, so good luck finding one) or a fan driven by an alternative power source such as a water wheel.