This is also good for workers in that most compensation conversations in my experience (professional agency recruiter for 2 years now), start with the employer asking "how much did you make in your last role"
Anyone answering that question would be including bonuses. Or maybe you use a question like that to determine who the suckers are? How does one’s compensation at their previous company have any bearing whatsoever on how much value they can provide to a new employer, other than trying to low-ball them?