Back in Master of Orion 2, when creating a custom race you'd neven take science bonuses without also taking production bonuses. Otherwise you'd have a huge list of stuff you can build but can't get anything done. Ships with big weapons taking 40 turns to build while your opponents build somewhat lesser ships in 1/8th the time. MoO2 was a very different game but having the receiving of technology and the implementation be two separate obstacles could keep science alone from being the only concern.