Most lightning rod proposals seem more interested in creating overpowered items or making creeper charging or mob conversion (witch or pigman) easy. [Much of the opposition to various proposals seems to have been based on these aspects.]
Of those listed, the first and last are most focused on the actual lightning rod as a way to protect areas (although 2850398-tall-metal-structures-attract-lightning brings electricty into the mix).
With the coming addition of the channeling enchantment, mob transformation and creeper charging are no longer important considerations… although allowing a less efficient alternative way of enhancing the natural chance of such occurances may still be useful….
A comparatively easy to craft [not first day, but far from end-game] item that would protect a limited area from natural (ie. not channeling produced) lightning would be, IMO, a useful addition.
This would allow far more variation in above-ground construction without needing to add roofs 3 blocks up and 6 blocks out in each direction.
2609312-iron-bars-as-lightning-rods [from tank_101] proposes a 20 radius AoE [area of effect], I think limiting this to the chunk in which the lightning rod is located might be simpler.
My reading of this proposal indicates it affects only where the lightning strikes; matters proceed as normal from that point.
Providing a late-game enhancement to this proposal [possibly by adding an end rod beneath the trio of iron bars ?] that would also prevent lightning summoned by channeling might also be a viable addition.
[With regard to placement: allowing the lighting rod to be placed horizontally (posible if "They would be placed like end rods" ) seems "wrong"; the iconic vertical spire is something I'd like to preserve.
The multi-block structure and additional conditions of tank_101's proposal seem more balanced to me than a single block item… (although a construct that could be hidden under blocks while remaining effective has appealing potential as well).]
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WARNING: I have an extemely "grindy" playstyle; YMMV — if this doesn't seem fun to you, mine what you can from it & bin the rest.
If I could work out an unambiguous way to detect the "storm" condition, I've thought of having a command block summon lightning to an iron bar on top of a tower just for looks. If I've access to /op to do command blocks, it never occurred to me to bother with using it for OP gear or charging creepers.