Not mine, I have hens that are 8 years old. You are confusing industrial ag with backyard chickens. Adding a couple of hours of light never harmed my hens. 24 hrs. of light may harm them like battery hens, I don't know.Artificial light also shortens a chicken’s life span.
Hearing something is just anecdotal evidence. It could just as likely have been caused by poor care and breeding. Probably both.I have heard of some cases where people used lights over the course of winter and the hen lived for only 2 yrs.
I'm not going to let my hens sit in the dark. Even in your area during the winter your chickens will have days that they have to sit in the cold dark for over 12 hours. To me, that's cruel and unhealthy.So if you want your chicken to lay eggs for longer, let them lay naturally.
Not true.It is healthier for them and also from what I have heard, eggs that are laid naturally without artificial light, taste better.