I had many years ago a home owner in The Villages get a buzz form a shower valve in the guest bath because the GFI circuit home run got nicked as it was pulled through the attic, it was tie wrapped to the metal stud with the nick hitting the metal. Good thing it was a fiberglass shower!

This topic is getting quite long but you could carry this to the extreme. What about aluminum soffet and trim. Add a couple of spotlights. Plastic box with metal trim.

Then add xmas lights all over the facia.

Then rely on the bad gfi that has not been tested since 1980.

If it was a cast iron or steel tub with copper plumbing it probably would of tripped the GFI or regular breaker.

So much for non conductive plumbing materials.

Actually I would not be opposed to expanding the existing Florida FBC rule on bonding steel studs to also bonding aluminum siding, soffit etc if there is electrical wiring or other equipment installed on or through it. The real question would be "how?".
The Christmas light scenario is not as dangerous as a short to the ungrounded conductor feeding a plastic jelly jar in a plastic box. At least those Christmas lights should be on a GFCI circuit.