Actually , units could be upgraded without reserching new Advances!
I'm think at WWII, take tanks or planes as an example. At the begining of conflict, tanks had 20-30 mm thick armor (the Matilda II was the expcetion, not the rule!) and 35-45 mm guns. In 2-3 years, they evolved to 100-110 mm thick armor and 85-100 mm high velocity guns. Same with planes. They evolved in the space of few years more than evolved in previous 12-20 years!
But they we're still tanks and planes, no new unit types!
In civ, we could have something like this. If a conflict is inevitable (or is already undergoing), you could research not a new advance, but an upgrade to the current units you have! Such reserach could cost less than a normal advance, around 200-300 science 'bulbs'. The result would be a unit with increased attack/defense points! Each unit type could have a maximum upgradability.
Ex. Phalanx starts with 1 attack/2 defense. You spend some reserach in increasing the Phalanx capability and you 'discover' the Phalanx Mk II, with 2 attack/3 defense. Further research leads to the Phalanx Mk III, which has 2 attack/4 defense! And this is the maximum upgradability of the Phalanx. I'm thinking at different upgradabilities for attack/defense in order to preserve the original offensive/defensive nature of the unit. Mobility should be also subject to upgrades.
This could be applied to any unit type, of course.
Same with Armor, but an Armor has a much higher upgradability. Maybe it could be upgraded up to an Armor Mk VII or even an Armor Mk X, with 20 attack/15 defense.
Each upgrade would also increase the production cost of the unit by 10-15% (maybe even the maintenance cost).
These upgrades should be available as any other science advance. Instead of selecting "Literacy", you could select "Phalanx Mk II" or "Cannon Mk III" as a research.
These researches could be done in War time or in Peace time, no matter.
Once you researched an upgraded unit, it's available for production. It should have the same icon as the basic unit. Leonardo's Workshop should upgrade all units to highest possible model, of course.
I think is a simple yet realistic model!
I'm think at WWII, take tanks or planes as an example. At the begining of conflict, tanks had 20-30 mm thick armor (the Matilda II was the expcetion, not the rule!) and 35-45 mm guns. In 2-3 years, they evolved to 100-110 mm thick armor and 85-100 mm high velocity guns. Same with planes. They evolved in the space of few years more than evolved in previous 12-20 years!
But they we're still tanks and planes, no new unit types!
In civ, we could have something like this. If a conflict is inevitable (or is already undergoing), you could research not a new advance, but an upgrade to the current units you have! Such reserach could cost less than a normal advance, around 200-300 science 'bulbs'. The result would be a unit with increased attack/defense points! Each unit type could have a maximum upgradability.
Ex. Phalanx starts with 1 attack/2 defense. You spend some reserach in increasing the Phalanx capability and you 'discover' the Phalanx Mk II, with 2 attack/3 defense. Further research leads to the Phalanx Mk III, which has 2 attack/4 defense! And this is the maximum upgradability of the Phalanx. I'm thinking at different upgradabilities for attack/defense in order to preserve the original offensive/defensive nature of the unit. Mobility should be also subject to upgrades.
This could be applied to any unit type, of course.
Same with Armor, but an Armor has a much higher upgradability. Maybe it could be upgraded up to an Armor Mk VII or even an Armor Mk X, with 20 attack/15 defense.
Each upgrade would also increase the production cost of the unit by 10-15% (maybe even the maintenance cost).
These upgrades should be available as any other science advance. Instead of selecting "Literacy", you could select "Phalanx Mk II" or "Cannon Mk III" as a research.
These researches could be done in War time or in Peace time, no matter.
Once you researched an upgraded unit, it's available for production. It should have the same icon as the basic unit. Leonardo's Workshop should upgrade all units to highest possible model, of course.
I think is a simple yet realistic model!

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