That was the issue I had with TBH when I was researching getting into this. I don't have any of the experience you and others have on this forum, but I studied everything I could get my hands on for a couple years before I started. The natural inclination of the bees seems to be to store honey up and to build brood down. At least that was the impression I was left with. Also the horizontal hive makes winter tougher on the cluster. Even bees that build in the walls of houses tend to build like that. Be interested in what others think about it.
Thanks Apis