Making research cost more for bigger empires
AKA research scaling
In most TBS strategy games I have played, the amount of research points created by an empire increases with its size, while the points cost of the technologies remains constant (at least with respect to the size of the empire). This gives empires who grow quickly in size early in the game, either by building or by conquering a lot of cities, a non-negligible technological advantage compared to smaller nations.
To counter this, I am proposing to make research costs increase with the size of an empire, thus making larger empires get new breakthroughs at the same speed as smaller ones (or even slower if their infrastructure is not as well developed). Note that I explicitly don't propose any particular way to do the scaling, or to define what "bigger" means in term of empires. I think that any such suggestion would only muddle the whole discussion about whether the game would be more enjoyable with some sort of scaling or not.
Advantages to scaling :
- Staying small and focusing on research become a viable long term strategy.
- Reduces the steam rolling aspect of large empires without having to cripple their economies.
- Closer to what actually happened in the Antiquity and the Middle-Ages, where cities-states (like in Greece or Italy) where a lot more creative than large empires (Roman Empire, Egypt).
- Alliances of smaller states get an easier time defending from the huge bully.
- Gives reasons to simply pillage instead of always occupy conquered cities. Also gives reasons to give away less useful cities to some vassal.
Disadvantages to scaling :
- Less intuitive to players, as less (territory) is sometimes more (research).
- Can be less fun to players who like to steam roll their opponent with advanced weaponry.
- Can badly interact with technological trading. (Note : depend strongly on how the trading is implemented, so it can go from being completely broken to working perfectly fine.)
And of course I missed some important arguments on both side of the fence, but this is only what I could though of.
So, what are your opinions about this question? Should large empires research be penalized to make it more in line with the smaller empire research? Or is it fine like in most TBS, where research costs do not depend on the empire size?