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You open your incubator in the couple days before your eggs hatch? Don't your chicks dry out in the shells?
The reason people "lock down" eggs in an incubator is to maintain the humidity necessary for the eggs to hatch. Otherwise a lot of people would have their hands in the incubator every five minutes (to candle, to look, to handle the eggs, or help too early, etc) and the membranes can shrink wrap around the chick as they dry out from the lack of humidity. If you're someplace where the ambient humidity is right, i guess it wouldn't matter if you opened the incubator a lot, but that would be sort of rare.
If you leave the incubator closed until hatch, it's the same thing as "lockdown" you just weren't calling it that.