I think in many of those cases, it's to train new layers to use the nest boxes, or to retrain birds (often free rangers) who've gotten out of the habit of using them.But then so many say hey I leave them in the coop until they lay, which can be anytime up til noon.
My auto door is set to open at 7:45 AM, winter or summer. I don't get up until about 1 - 1 1/2 hrs later, so the birds stay a little quieter longer if they're kept in like this, and this also keeps them safe during sunrise hours when we tend to get the most predator traffic passing by (our set up is by a creek).What do you do and what time is your door set to open in am for food access?
I adjust the close timer throughout the year so it closes soon after dusk.