Speculation. Why We Can't Have An Attraction System

"Grynn;c-16805589" wrote:
Just use an Autonomy mod and you'll see that what The Sims 4 already has a chemistry much better than previous iterations

I think this has everything to do with the mod and not any chemistry system that you think is present in the game. Some traits alter how often flirting and romantic behavior occurs, but beyond that there is no real system at play.