Hi.
It is a very hard decision to upgrade a unit, because after that it will need a higher level factory to produce.
In my opinion the game should change: a player should be able to produce a unit in any level he researched. If he has lvl4 light tank researched, he should be able to build lvl1,lvl2,lvl3 and lvl4 LT up to him. In this case newly captured territories could be used faster for unit producing.
And it also makes sense. Once he has that technology why can't one use older technology for a faster production in case of?
It is a very hard decision to upgrade a unit, because after that it will need a higher level factory to produce.
In my opinion the game should change: a player should be able to produce a unit in any level he researched. If he has lvl4 light tank researched, he should be able to build lvl1,lvl2,lvl3 and lvl4 LT up to him. In this case newly captured territories could be used faster for unit producing.
And it also makes sense. Once he has that technology why can't one use older technology for a faster production in case of?