Synchronized resignations are definitely more of a headache than staggered ones. For example, in a normal situation if I quit my boss will be able to hire someo

Synchronized resignations are definitely more of a headache than staggered ones. For example, in a normal situation if I quit my boss will be able to hire someone to replace me, knowing what my strengths and weaknesses are and what gaps my departure has created for the team. If they quit then I am a source of information to whoever is hired to replace them. Of course anyone is replaceable but some knowledge will be lost. Also your model does not account for businesses which are aggressively expanding and doing a better job than the average employer retaining their employees by either being a genuinely great place to work or LTIPs