I actually agree. First off, I'm TX so the temps are warmer here to begin with, but my girls feathered out much quicker because I took them from the brooder to the coop within 4 weeks and by week 4 people thought they were older than they actually were because they had feathered out more than a 4 week old chick. I learned that from an OT'er on the Texas thread and it worked. I don't know if you could do that in all climates, but in Texas it's warm so I was able to without being worried of them killing over from the cold and not having enough feathers.
X2 here in South Carolina.