A brand new autonomy system for your sims to follow so they don't grab a drink in the middle of winter, get into their swimwear and sit at the side of a iced up pool, legs dangling in the freezing water, and they die from being frozen to death.
So sims don't go outside in a thunderstorm without the reward trait storm chaser, and get struck by lightning twice and die just to absurdly mop a puddle up.
An autonomy built on common sense, fix the sims basic motives first and then whatever else they wish to do in order of their traits and likes/dislikes. at least to start off with.