[Puke]

it cant be 'fixed' without either lowering the retrofit percentage from 50 to something else, which would probably break retrofitting. I think its fine in a simultanious game where each step takes a full turn, and you still have to pay the higher cost to get it done faster. i hardly ever have the resources to retrofit with anyhow. if you have leftover resources, then your fleet is too small.

the real exploit is in a sequential game where you can do all those steps in one turn, but those are mostly single player and as such you are only cheating yourself.

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"...the green, sticky spawn of the stars"
(with apologies to H.P.L.)