Since when do your line managers choose to stack rank?

Do you know what stank ranking even is and where it comes from? If you have to rate your group from 1 to 5, each individual, and you rate them all 4s and 5s, they crack down and force you to select a 2 and a 3 and only have one 5. Now, would you prefer a CFO, CTO or even a project manager be the one to do it? It's a weird comment.