Having been fired once at the 10-month mark early in my career, not for misconduct and not after any prior performance warnings, the 1-year cliff can be heavily

Having been fired once at the 10-month mark early in my career, not for misconduct and not after any prior performance warnings, the 1-year cliff can be heavily abused by employers. Your argument assumes the employee has the control over when they leave, which isn't always true. (In actual fact I was then a pretty underperforming employee who misunderstood the situation, but the apparent trigger for me getting fired was my own request for help addressing the situation since I realized something was wrong. The startup founders were as early-career as me and didn't really know how to give me the feedback I needed. My next employer did give me the necessary constructive criticism, after which I made the necessary changes, got subsequent positive feedback from that same employer, and have been a decent to good employee everywhere I've been since then.)