Matters

Idealized worlds crumble. It's good to have a few sweets to snack on while the sky falls. Realism just tries to avoid the biggest chunks.

Just because a form of structure has been implemented doesn't mean the form is realistic. Reality will eventually test it. Time tells.

Doors made of antimatter can't be opened by material things without a release of massive energy. Would both be destroyed? Maybe they'll become something new.