I can't speak to this per say, but I can offer a general thread derail on a similar topic, technology and how technology has impacted literature (and I use the term literature very loosely).
I just finished reading Grisham's the Testament. Great read, zipped through it in 3 days.
ANyways, the book takes place in 1996, so the internet is there but not a heavy factor in the book, same with cell phones. But an interesting thing was the lack of GPS finder type systems.
The reason this is important is that a MAJOR plot point developed because of the lack of a GPS finder, the MC was on an important mission in the middle of nowhere and got lost.
Similarly, the lack of cellphone <=>internet link resulting in another MAJOR plot point being developed.
My point? I loved the story, but had I not have grown up in the 80s and 90s the story would have felt dated. I can't imagine 'kids' today getting the same enjoyment of the story because they would keep thinking, "Well gee, why doesn't the MC just use his cell phone, grab a google Map, cross reference with a GPS and there, problem solved"
So, in regards to your question about the dark. I would anticipate that books featuring this subject are going to vary by plot point. In fact, I would argue that the further back you go, the more 'significant' the dark would be since 'conflict' makes stories.
We take so many things for granted, like flashlights. flashlights work in all weather, all climates, easily lasts 10 hours if need be, and is 10 x better than a torch in terms of seeing/praticalities.
Now imagine going camping and a camper gets lost out in the wilderness while it is raining. IN this modern day scenario, no big deal, just whip out some flashlights and find him.
Picture this same scenario back in 1809. Now we have a problem. Torches don't do well in rain.
that simple twist adds more potential for conflict.
But as we modernize, the only way to get those same conflicts is with a whole bunch of actions that result in the MC being unable to use modern conveniences. The more excuses you have to use, the harder it is for the reader to suspend their disbelief.
o.k. now I'm babbling and not even sure if i'm addressing your question so I will just stop for now
Mel...