As soon as one person tries that then it'll just mean managers are exceedingly careful with their words, and there will be zero difference in the resulting acti

As soon as one person tries that then it'll just mean managers are exceedingly careful with their words, and there will be zero difference in the resulting action that comes out of perf reviews. The threat of suing won't mean you get a better pay review, it won't improve your promotion prospects, it won't stop people getting pipped or fired if needed.