I believe that colonies in first year developement should be given additional boxes below. When we were actively keeping bees, we added boxes at the top like everyone else, knowing full well that it does not support bee instincts. It's just easier and quicker.
The starter colony goes to the top of the cavity and builds comb downward by instinct, building a broodnest leading comb construction. As the broodnest approaches an adequate size for the cavity volume, they continue to move the broodnest down and fill in above with wintering honey. This can be seen in the single deep by the capped honey accumulating in the upper, outside corners of a deep frame.
Note that there is almost always a delay when the second box is added above. Not only have we changed the cavity volume, but we did it in the wrong direction. Bees are notably adaptive to circumstance and do figure it out, it just takes some time.
Did a limited sample test to confirm my opinion, and was satisfied with the results. Should I ever start over, will try to support their druthers.
Walt