An idea about upgrading units (general theory)

[DeckerdJames]

An idea about upgrading units.
Upgrading is automatic based on your budgeting. You handle it through the government.
Big budget, faster upgrades. Lower budget, slower upgrades. Lower than that is maintenance. Lower than that leads to an ineffective army.
Wherever they are it happens as soon as the game system upgrades it. They upgrade based on their range to the source of the money. The seat of the government.

 

[GeneralZift]

Actually like this idea, but unfortunately seems infeasible because you have little or no control over what gets upgraded.

 

[DeckerdJames]

You could have a manual option too and the ability to turn off automatic upgrades.