I think its mainly a wise recommendation if you dont want a staggered hatch because that is what is happening with uncontrolled eggs. There are often eggs nearly full developed that get abandoned because the 2 - max 3 days old need to be fed.
Thats why I always changed fake eggs with eggs that were marked. Took away newly laid eggs. Even then I had differences in the day of hatch. Although never to a problematic extend.
But that's exactly the benefit of having a secluded nest, typical for birds who want to go broody. Less females are likely to lay their eggs while theyre brooding
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