Well but your subsequent tech also increases your tech cost. In blind research I think you just can't think about tech cost too much and all you can do is hope for good luck. 
You can at least set a reseach direction though. And AAs might give you a tech that is not your intended direction. So it may still have a small difference I suppose.

You can at least set a reseach direction though. And AAs might give you a tech that is not your intended direction. So it may still have a small difference I suppose.
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