Stack ranking is not my cup of tea at all. But, yes, I'm kind of leaning against performance reviews as well. It's an open question in my mind. I appreciate that big companies might have a challenge on their hands, and I don't have a lot of answers, here. But in my experience, performance reviews have not added anything obviously positive to the workplace, and they're invariably a source of friction. Which seems willfully obtuse when a company has an attrition problem. And I say this as someone who is not considered a low performer.