My "favorite" of those email changes is the self-inflicted contractor postfix change. I've worked at places where a conversion to employee forces the creation of a completely new account, and lacking a simple, single permission systems, the act of converting means spending a good 3 weeks trying to get access to systems one had access the day before.

This is extra fun when the company in question does a lot of their business offering complicated accounts to customers, and has an external facing identity solution that deals with all of this easily: just not for their own workers, including those maintaining the external-facing identity system.