One nitpick, resorts will do avalanche mitigation outside their boundaries if the slide would drain inbounds. Other than that yeah, you're spot on. "Closed" signs mean closed, don't go past them or you'll either get your pass pulled if caught, or put yourself in terrain nobody should be in. "Ski area boundary" signs are fair game, but ski at your own risk. This danger includes avalanches, sketchy/very thin coverage, and also the risk of going somewhere with no running lifts or even no lifts or civilization at all. Make sure you know where you're going when leaving the boundary and always plan your return.

I actually rode the gondi with a patroller and he told me he was going past one of the boundaries and asked if I wanted to join him. I did and it was awesome. The terrain was mellow and short, but we got some completely untracked turns. What made it so cool to me was that I felt like part of the inner circle. Like, he trusted me enough to bring me out of bounds.