This is not accurate.

Sure, aluminum shafts could get a LOT worse and still 'look straight' than carbon arrows can (i.e. the mythology of "it's either straight, or broken"). But when you spin a few different brands of +/- 0.01" shafts against an indicator after a dozen shots into a bag target with each, you can see the difference between higher end shafts and lower end ones (or better still, the difference in quality/durability between two HIGH cost shafts).

I left carbon express after many years for this reason. A dozen shots into a bag with +/-0.01" GT's and I'd show +/- 0.06", simply rolling on the spin rack with light pressure and they'd true up to +/-0.02". I did the same with a set of Easton's and a set of CE's, same 0.04-0.08" range, then after a simple truing attempt, they just didn't get any better.

Buying +/-0.01" shafts only means they were +/-0.01" straightness when the representative shaft from the lot was tested at the factory (some manufacturers validate ALL shafts, not just straw samples). What happens to it between packaging, retail sale, and a few dozen or few hundred shots into a bag can change that.