That was the source of my original joke, which seems to have been turned into a serious discussion! Not that I’m opposed to that at all!
I think it’s because the nostalgia for the 80s was created by people who learned about the 80s primarily through 80s movies. they were born in 84, which means they only probably directly remember the last part of the 80s, but their aesthetic seems to me to be pure mid 80s.