It all depends... When we choose to incubate eggs, we are taking a natural process, and turning it into a very un-natural process. The chick could have had difficulty hatching because our hatching method was less than perfect. Temperature, humidity, even not getting turned the way a broody would have done it... or overly chilled prior to incubation. Then you have the nutritional factors: how was the hen and cock's diet leading up to the day the egg was laid? And last, you have the genetics involved. If the chick has no genetic or congenital flaws, it has every chance to grow up to be a lovely hen that you wouldn't be able to tell from the rest of her flock mates... In comparison, many children who started out life in NICU, on life support, because they were born too early, or born with respiratory issues, grow up to be healthy adults with no residual problems.