I would not ever argue and say that anyone is wrong in their opinion. In fact, I would be more likely to say that it is I that is wrong. I love my birds, but they are chickens. I may get choked up if one gets sick and dies or meets up with a devil dog, but not for too long. This year alone, I bought 30, introduced the same night, and 40, introduced the same night. I have about 110 birds and need to scale it back, starting with some aggressive roos.
But... My integration is, has, and will continue to be bring in new birds within 1 hour of dusk. Let them fuss, separating only if blood, just like teenagers. At dark, put the new birds on roost, close to homie's if you have to or even integrate. Let fuss, although very little. Next morning, feed, leave and go to work. By evening, mine have been fine.
Yes, I risk disease with terrible bio security.
But.... just another method from a man that frequently says let God, when Carla says what about this, what about that, should we call the vet etc....