What we see on Stranger Things is just advertisements for IP from the 1980s. Everything from Ghostbusters to Neverending Story to D&D is just a brand name. Hell, the centerpiece of Season 4 was a mega-mall.

It's history through the eyes of Madison Avenue. Great if your goal is to recycle period kitche at obscene mark-ups. Which... in fairness... was the design philosophy of much of 1980s mass media.