Ok, FWIW, I just talked to my friend who's a Nissan master tech and he was saying the reason you aren't supposed to torque down a rubber bushing without load is because the control arms will twist/turn slightly once you set the car down and since rubber bushings are not made to turn inside the "socket" the rubber will just twist which can cause them to crack/break prematurely due to constant stress. But since bearings are made to turn, then it's no issue!
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