Gotcha - used to breed horses know all about breed standards!Doesn't effect quality of life at all. It's just a missing feather on the wings. If you're showing it's a big deal. I've given away pullets before as pets because of the fault. Just like how wrong number of toes doesn't effect them but shouldn't be bred as it too is a disqualification from standard.
Vulture hocks is also a disqualification but doesn't effect them. That's hard feathers at the bend on the leg.
As with many traits, you need to select for or against. Want decent layers? Breed only the ones that lay decently or you will see production go down in future generations.