Well, you may be right.
However I would see fitting some "unhappynes events" time-to-time, something like the dock worker's strike.
Maybe:
Once you have Factory or Manufacturing Plant + Robotics tech in your cities some people lose their job and prostrate against the goverment, but by time thay get used to the situation.
So you get some
penalty for some time, that fades away, and the event also gets obsolate by some newer tech (Post-scarcity perhaps), so you don't see it again in your newer cities when building Factory and Manufacturing Plant.
How does that sound?
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