I'm certainly just a beginner, but what I was taught in my Suspension class was that you didn't want the driveshaft perfectly straight (0deg working angle). That was because the needle bearings inside the bearing cap need some force to rotate. Without rotation they can exert a constant force in one spot and cause damage to the bearing journal.
Least that is what I have in my notes. Is this not a valid concern? (trying to learn here).
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