Not sure if his is restricted to the GrT pack, but I assume it might have been packed to base game, too. How do you guys use the chemistry system in your game? I do appreciate the symbols in the...
I usually check for compatibilities and try to match sims with good or amazing compatibilities. If some sims don't seem to get any matches at all it's usually because they have a game-given dislike so I get rid of these routinely so they can have better matches. Do keep the likes though.