When things become probabilistic instead of deterministic, you’re probably there.
That means that when every outcome isn’t exactly reproducible, you’re pushing the boundaries. Watch Jerry Seinfeld’s Comedian and you’ll see even for a rehearsed performance, he’s not always happy the way it happens. And that’s a guy that’s at the level of legend!
If you can go in and knock it out of the park every time, you’re not pushing boundaries. It’s time to grow into something more challenging.