[faanghacker]

I noticed that most if not all of these questions are applicable to doors in even simple 2D games.

Whereas the physics engine and real-world realism aspects are what the video talks about.

If the problem is that doors are inherently difficult to design, the counterpoint is that these questions have already been answered in multiple ways over the past 30+ years of video game history. It's easier today than ever to answer these questions by drawing on previous games.