> And hens aren’t supposed make eggs year round but we make them anyway with artificial lights etc, which drastically shortens their lifespan.

I kept a flock of 25-30 hens on my property for a few years. Other than moulting they produce eggs ease round. The production slows drastically in the dark winter months for the older hens (1 for 3 days, say) but some continue to produce nearly daily (I think the cycle is something like 26-28 hours). The only time we had artificial light for them was on days when it was so cold we kept their coop door shut and turned on the interior light.