It ain’t always so.
Look at what I did to my brand new, high-quality needles after casting on and knitting just two rounds:
The worst part of it is, they’re too small for the project for which I bought them ... so I may get to repeat this fun with another set of circulars! The good news is the needles are still usable ... it’s just that they’re so small, I don’t know what I might use them for. (I said I’d never knit a sweater from sock yarn, but maybe I spoke too soon.)