The differences wouldn't be nearly as dramatic though.
Memes
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The whole no internet thing would be pretty different. Marty was a high schooler. Going back to 93 would still be quite weird for him
The internet absolutely existed in 1993, but it was vastly different from today
Mostly just in universities and government until 1994. There were BBSs and online services, but not really public internet.
Yeah, the biggest delineation is "world without computers and digital electronics" vs. the world after all that proliferated. I'd still consider the 80s and 90s part of the "modern" era, what we used to call the "information age" or "computer revolution".
Pretty much all our modern tech is just more advanced versions of the same shit we already had in the 80s. Even social media (BBSs).
Well BBSs, Usenet, etc were far more niche. Social media today is nearly ubiquitous.
Marty plays EDM at the prom instead of rock and roll
I'd go back to '93. Vs. had just been released, Jurassic Park was in theaters, the US dollar had almost exactly double the buying power it has today, and I still remember how to design web sites using tables.