"Wow, the builder seemed to be specifically trying to make the worse in all aspects. But the main thing is the design, how terrible it looks. But you don't have to tear down the ceiling like everyone says. Try contacting
stagers for homes, as an option. Instead of removing this flaw, interior designers will help you hide it. You ask how? Basically, some interior elements will be added, such as chandeliers, bedside tables, possibly painting, and so on. At a minimum, I am sure that the view will be better than it is now, and this applies not only to the ceiling, but to each of the rooms. For example, I used to have a huge hole in the wall, and now there is a very cool hanging shelf on that place. "
That is a crazy idea. Just finish the drywall properly. It will probably now require a plastering rod to make the ceiling straight and flat. But it is what it is.Use a different and capable drywaller. Fix the ceiling properly.