In #DeathRoadToCanada, I don't think that anyone knows that you can barricade doors with furniture. If you push a chair, couch, dresser etc. up against a closed door, then it basically adds to the door's health bar vs smashy thumpy zombies.
Programming was easier in the 80's, and early 90's, because there were not 1000 different systems and options and targets and BULLSHIT to deal with. We are just constantly making more problems for ourselves, designing increasingly intricate doilies, when a napkin will work.