I'd like to start by saying you made a very good argument here, but I would like to make some comments of my own as someone who is absolutely infatuated with this genre. You mention that a lot of synthwave is easy listening, but ironically most of the synthwave artists I tend to enjoy are a lot more "hardcore" I'd list 'carpenter brut','dance with the dead' and 'master boot record' as some good counterexamples to what you described. As for the social aspect, many people agree that the movie 'Drive' really kicked off the modern synthwave movement with its soundtrack and how the music played into the actions of the main character. The interesting thing about that movie is that it exists in a world almost directly opposite of what you described as "smooth social brand exterior" all the characters are living in some form of grime or filth, and the main character is a socially stunted badass. This movie (atleast for me) really set the stage of what synthwave conveyed, its fantasy of what I was told growing up were better times. Hotline Miami is another piece of art that prominently uses the genre to convey harsh ultra violent scenes of death and destruction, the beat and tempo drive the player to move quickly and kill swiftly in these dingy crime infested apartment complexes. Because I was so heavily influenced by Drive and Hotline Miami I see the genre as this brooding soundtrack for antihero's, like the kind of music that plays when the protagonist does some horrible stuff and subsequently smokes a cigarette looking off into the distance trying to understand what they just did. I'll post some example tracks below of darker stuff that fits this ethos.
https://m.youtube.com/watch?v=wy9r2qeouiQ