As often discussed, climate plays a big role in beekeeping. Although horizontal TBH can thrive where the climate is mild, they do not fair as well in cold climates. When given the choice, bees will build their nest in a vertical fashion, which better allows them to survive in harsher climates. By being vertical, they start the winter with all the stores above them, as winter progresses, they simply move up without having to break cluster. As heat rises, the new stores above them are preheated as they move up. Horizontal TBHs require the bees to break cluster to move from comb to comb as they progress forward or backwards in the hive. Long stretches of extreme cold can cause them the starve if they can't move to another comb. I have many years of experience with both Langstroth and TBHs (vertical and horizontal) and no longer try to keep horizontal TBH and recommend my students against them as well. I have no issue with the principal of TBHs and have kept a few Warre hives for close to 10 years. As others have mentioned, the Langstroth offers so many advantages when it comes to purchasing bees, purchasing equipment, ease of inspections/manipulations, ease of honey extracting, and salvage/reuse of comb. I have been treatment free for close to 10 years as well, simply by providing breaks in brood.
The biggest thing I run into with folks who are TBH fanatics is the mis-belief that the more primitive the hive, the more "natural" it is. As I start every new beekeeper class with the statement that there is nothing natural about beekeeping. A truly natural feral hive is never opened up, never has it's interior exposed to light, and never has it sent and heat dissipated by being exposed. Not to mention the fact that feral colonies attempt to eliminate all ventilation accept the entrance hole (at least here in the Northeast) and the most emphasized practice by beekeepers is ventilate, ventilate, ventilate.
Beekeeping can be very discouraging when failure occurs and often people get frustrated and throw in the towel. At least here in the Northeast, beginners have a much higher success rate if they start with Langstroth's.
If everyone liked vanilla, they wouldn't make chocolate...............