Put it this way. It’s just a wall with an add on where it can open. That’s the jobs of a door. It acts like a wall, but it’s interactable. Even though it’s weaker than just a regular wall, it’s the one that will stand with the walls it’s surrounded by.

I feel like a door can show resilience because it is shown as a strong object that can resist many things. It’s a good sign of protection in my opinion.