The post I responded to said

" Since the IC carbons are made with various angled, perpendicular, and parallel weaves, over this time, those layers basically shift. This affects the spine of the arrows, and basically they “bend”."

I posted to say this is not true- the graphite layers never shift. I also contend that the inherent strength of a graphite arrow is much greater than people believe. If you throw out your graphite arrows after a year or two because you think your spines have " degraded" from being shot too many times- you are wasting your money. A graphite arrow shot into fairly soft targets would last a lifetime if treated properly. But hit one rock, whack the arrow sideways into something, or shoot into abrasive targets repeatedly- and all bets are off.