I think what Blackout's trying to get across is that with everything level, the only the time the outer CV's see any major angle is when turning, which is barely any. Go for a drive and see what distance your front wheels spend turned at any significant angle. For most people I'd bet it's maybe 2% of the miles they travel. Also, almost no angle is ever applied at higher speed.
Compare this to a leveled truck that sees angle 100% of the time, whether it's turning or not, and the CV's are angled no matter the speed.