Makes no sense. As it has been stated before, once you researched it, you've researched it. That's like saying because I don't know how a gun works I can't shoot it. Completely irrational, while I understand from a gameplay point of view, it takes so long to research that far up the tree's, by the time they have all of one type researched, they will be so lacking in the other department I doubt they will actually be a threat.
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its a game mechanic the devs introduced to stop people from cheat reaserching EVERYTHING
IC changed it so to have access to that tech you need to keep the required amount of research posts, which in my opinion seems right otherwise people will just quickly rush up 8 military research station research everything destroy them all and do the same thing with civilian
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and it adds tactical depth by allowing players to knock out each others research station to cripple your enemy MWA HAHAHAHAHA