With such oversized and heavy designs, is there a risk of the door leaf sagging after 3+ years?

Our engineering core lies in eliminating sagging risks through "Structural Redundancy." First, we accurately estimate the door leaf weight. Second, we determine the number of heavy-duty hinges and the thickness/structure of the frame accordingly. We ensure the combined load-bearing capacity of the frame and hinges significantly exceeds the door's weight, physically preventing any displacement over time and ensuring long-term operational safety.