Haha, well, this shows that whether you opt for metal roofing or R.C. flat roof, you are still deploying an almost flat angle to balance the need for maximum number of stories and also maximum floor to floor height.😉
It seems that you are a very savvy home owner and blessed to be working with a good builder & architect. Congrats! 💪 However, others may not so experienced in home-building and when they deal directly with a builder without guidance, sometimes they have regrets. 🤣 These are real-life cases of unsatisfactory design and with a bit of sharing we can avoid it.
1. Many inter-terrace and corner terraces tend to become dark and stuffy at the middle of the building, so the traditional solution is to open an airwell to bring in light & air, for example in our traditional Chinese shophouses. But in our modern times, this concept seems to be forgotten or omitted to save cost. Often I see skylight is installed without any window openings nearby. The powerful tropical sun shoots into the centre of the house turning it into a sauna. The heat has no way to escape. So my suggestion is always consider a jack roof or nearby windows when you add a skylight, especially if all sides will be facing a solid wall or bedroom with closed doors.
2. True story: an elderly auntie of mine did A&A to her tile pitched roof for a bargain price. Then later complained that her attic was very hot and stuffy. When I visited, I realized that the builder did not install insulation at all. She wasn't even aware that roofs need insulation...😨 So do be careful. 😂
Hope this info helps!