It's useful as a Bayesian prior. Repeated past behavior is a reasonable predictor for future behavior. There may be context that explains it, but hiring is real

It's useful as a Bayesian prior. Repeated past behavior is a reasonable predictor for future behavior. There may be context that explains it, but hiring is really expensive and you want to get someone who will stick more than a year. Leave a job per year for 4 years is at least a yellow flag to me.