In previous Civ-like games, you would only need buildings like Aqueducts and Hab Complexes and Hospitals to increase a hard population cap. This is a similar thing
There is broad agreement that moving to the Civ4 system was a vast improvement over the artifical hardcaps of aquducts and hospitals required to grow over size X.
And now, happiness is an empire-based mechanic. It makes no sense to impose arbitrary city-based limits on it.
This would be like preventing a small city from building a courthouse in Civ4. Not a good plan.
Its a much better design to use sticks and carrots, rather than highly prescriptive hardcaps which limit the player.
The problem with a linear trend is, happiness wise, when will building another city ever become a bad idea?
Because the fixed happiness bonus from your luxuries, many social policies (protectionism, cultural diplomacy, legalism), difficulty level and wonders is being spread over more and more cities, so the average happiness per city is declining.
Still, its hard to get a formula that doesn't feel arbitrary and forcing (Thou Shalt Have This Many Cities).
Even supposing we could deal with fractional happiness (which is messy), what kind of formula would you propose?
Maybe something like marginal unhappiness from the Nth city = 1.5 + N/K
Where K depends on map size.
Why are scattered empires, in your view, a good thing?
Real life empires were often quite spread out, particularly using sea routes rather than land trade.
Greek and Roman empires went around the Mediterranean coast, they didn't just form a bubble around the capital. Medieval Spain/Hapsburgs controlled scattered territories throughout Europe.
Spain, England, France, Portugal and the Netherlands established major profitable colonies in the New World and scattered all over the globe.
The English ability and the Commerce tree are designed to be able to encourage a scattered playstyle, not just a circular land-based empire.
So: the point is, scattered empires are both realistic and fun.
Also, note that we can't move capitals anymore, so distance from Palace would be very broken.
I was of opinion that RL scattered empires are quite vulnerable.
This is still true even without distance maintenance costs, since it takes longer for your army to get to wherever it needs to be to respond to an invasion.
I gather that the only downside in CiV to settling on the other side of the globe is security.
And road costs, if you don't have harbors and a clear sea route.
And why should colonization be less painful?
Because distant colonization in Civ has always been near useless, because of the punitive distance modifiers.
The thing is, being able to settle half the world away to grab a happiness resource is exactly the problem you're trying to solve.
No its not. I have no problem with being able to do doing this. The problem isn't in building a distant city in a good place, its in being able to build cities everywhere.
Currently even the puniest of civilizations can be a globe-spanning Empire
You mean, like Portugal and the Netherlands?
I don't see the problem. If they're puny, then their possessions will be scattered and hard to defend, and it will be easy to pick them off piecemeal, particularly if they don't have a decent navy.