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

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).

Marty plays EDM at the prom instead of rock and roll