There's a reason Stranger Things was set in the 80's, and nostalgia wasn't the only driver... modern communication can ruin mystery and suspense, and if the kids had all had cell phones, it would have been a different story.
@CarlCravens The first (and only time) the Scooby gang had cell phones was pretty entertaining, but you never really saw them again.
Of course, Mystery Incorporated ended up being a prequel to Scooby Doo (and my favorite series).
@CarlCravens Modern mysteries also allow the dreaded moment of 'no signal' - something which can shivers down the spine of any whipper-snapper.
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