You should be so proud that you've managed to beat the system. Heartiest congratulations.
Will you be tempted to stay in your room during a real emergency too? Or will you be the one trying to figure out where to go?
Of course it "works different(ly) everywhere." But that's not because the rules are different. It's because they are not enforced uniformly.
What you have to remember is that the ship's staff is ALWAYS torn between enforcing the rules and pissing off customers who would think nothing of singling them out on the evaluation form for giving you bad service if they enforced rules you didn't like. So they tend not to "rock the boat" so you won't write them up or, if it's your steward, stiff them on the tip.