To target this point specifically, there is one big noticeable difference between fire and lightning. Fire is only ever fire, and is pretty consistent with how it functions in the real world and fiction normally. Lightning however, is only a form of electricity. And since this is only one form/state of electricity, we don't automatically assume that any signs of electricity equals lightning. Case in point the lightning standards of the site, they exist for that very reason. And in the case of the kido being argued, it fails to show those properties consistently enough to be just taken as that at face value.
And once again, naming really should not be taken so literally in bleach. Just like at all the other kido's out there:
Tsuriboshi means Suspending Star, yet it isn't an actual star and is more like a net to catch people
Kakushitsuijaku means Footprint-Attentive Pursuing-Sparrows, which honestly tells you little about what the actual kido does, this one being a kido that displays the longitude and latitude of your target.
Hyapporankan means Hundred Steps Fence and there is no fence with a hundred steps being made there, it's just a barrage of energy that overwhelms the target.
These aren't the only kido's that are like this so to assume that the name means exactly what it's saying isn't really backed by how the kido's are portrayed.