So all happiness from existing policies could settle to lower absolute value over time.
Alternatively complacency should be MUCH stronger and act in both ways.
Currently game is very flat.
This game doesn’t have accumulators (except debt), conditionals (except in achievements) and blowback.
This is why some people said this game is same as earlier democracies.
Now mostly people review it as incremental improvement over Democracy 3
Accumulators would allow for more realistic simulation of population, gdp and average temperature.
Accumulated values then could act as triggers for events.
Conditionals would allow for if-else policies, like no homosexual marriage if you ban homosexuality.
Or no private education/healthcare boosters, if you have policies banning them.
Blowback is temporarily increased happiness reaction - like you changed happiness by -0.1, then it will be changed by -0.2 temporarily (delta happiness multiplier).
Cancelling policy is equivalent of setting from any happiness level to zero happiness.