That's interesting to me as well Hillside. With my QHs, I don't halter them as weanlings anymore (my working type horses can't compete with the halter bred behemoths) but I do have a few friends that raise halter horses and they shoot for Jan 1 with every foal so they have the size advantage. Bigger the better I guess.
The only benefit for me would be extra time training under saddle, but a few months isn't worth fighting the cold in my book.
Life is like a camera. Focus on what's important, Capture the good times, Develop from the negatives and if things don't work out, Take another shot.