Quote of my post in Feedback:
Placed in a village (and spawned atop a "church" structure) any lightning that would spawn within the village hits the lightning rod instead. This would prevent villagers from turning to witches (and the loss of an important villager). Lightning is one reason among many you do NOT let villagers "roam free". The only way to keep your villagers alive and useful is to enslave and imprison them. This is silly. A "lightning rod" that spawns with the "church" (and not all villages spawn with a church) would go a long way towards the dream of "free range villagers" with the 1.14 update.
I'd like to have Mojang consider offering a "lightning rod" as part of the Villagers & Pillagers update. As mentioned in my comment above, my goal would be to see "free range" villagers in Vanilla. As things now stand, lightning is one among MANY dangers (including suicide by stupidity) that kill off villagers. A lightning rod spawning on a "church" with the release of updated village buildings would protect the villages lucky enough to spawn with it.
Since the Feedback Page is where suggestions have a chance to actually be read by Mojang, please consider voting on this issue and commenting further on the idea of some protection from lightning turning your free-range villagers into witches. Again, it doesn't have to be EVERY village, just the ones lucky enough to spawn with this on a specific building, and allow players to craft one.
Besides, wouldn't it be freakin' cool to have a castle with lightning rods on it to make it extra spooky during a thunderstorm?
The Meaning of Life, the Universe, and Everything.
This seems like an interesting idea, im not sure how needed it would be though. I would assume that the new Villager AI would detect when the weather changes to Lightning Storm and have all villagers return to their homes. Though i do like the idea of having lighting rods to use as traps.