Well, yes. But if I may, with specifics:
1. We might have exquisitely robust and invulnerable strategy in some matters, but utterly lack such cushion, in others. A person might diligently save for retirement but have a horrible blind-spot in say matters of health, or relationships. On the other hand, somebody might flub savings, investment and retirement - but remain in great health and stay lucratively employed to 75+... doing just fine, never having saved a nickel, having $0 in the 401K and living paycheck-to-paycheck.
2. Sometimes the very act of preparing for a rainy day, brings torrential rain. Less metaphorically, it may be so, that a person who's well-prepared for early retirement, who's comfortably affluent and frugal, grows jaded and complacent and passive in late-career. If you don't need the job, why keep hustling? Then without meaning to underperform or to become deadwood, this person is the first to be let go. Management is smarter than they look! They can tell if an employee is independently wealthy, even if that person drives a jalopy and wears tattered clothes.