Ahriman
Tyrant
Civ4 happiness works very differently than in Civ5, so I'm not sure Civ4 comparisons are very helpful. Civ4 happiness is city-based not empire based, Civ4 has war weariness (significantly rising happiness during wartime), and in Civ4 excess happiness has zero marginal benefit.
And of course, in Civ4, happiness is not the main limit on expansion (maintenance costs are), so relaxing happiness constraints does not allow for unchecked expansion.
So I don't think that Planetfall or Alpha Centauri are good guides.
I would oppose reducing the base happiness yield of buildings; I already think that happiness from buildings is too low relative to happiness from other sources.
I would also oppose forcing players into using specialists for happiness (which is what would happen if you reduced building happiness further).
You'd also start getting a position where, with the freedom policy that reduces specialist unhappiness, specialist citizens could provide positive net unhappiness, which I think is undesirable.
And of course, in Civ4, happiness is not the main limit on expansion (maintenance costs are), so relaxing happiness constraints does not allow for unchecked expansion.
So I don't think that Planetfall or Alpha Centauri are good guides.
I would oppose reducing the base happiness yield of buildings; I already think that happiness from buildings is too low relative to happiness from other sources.
I would also oppose forcing players into using specialists for happiness (which is what would happen if you reduced building happiness further).
You'd also start getting a position where, with the freedom policy that reduces specialist unhappiness, specialist citizens could provide positive net unhappiness, which I think is undesirable.