When I see a new "ding" on a lens hood, I usually think, oh good, that's a hit that my lens didn't get. Lens hoods do way more than stop flare. The strong flexible plastics used by Canon make the hoods brilliant shock absorbers.
As Barack Obama, the Pope, Ansel Adams & Queen Elizabeth always say, never leave home without your lens hood. How do they put it again? Always wear protection...
PW