And when you break the rules, you get absolutely no feedback. You don't even know if you break the rules, or you were just beat by a candidate the interviewers preferred. I had to go through the process last year and hated almost every microsecond of it, except my interview with the place that actually hired me.
Back in the 90s, looking for a job wasn't so bad. Now it's a nightmare.
But you don't get to know the rules.