Most of the time the advice coming from those who work in technology or security will tell you not to ever share passwords, user accounts, or devices, as well as not to reuse credentials or use easy passwords. These are some of the basics of protecting your personal identity and data. However, there are a couple of situations where duplication of accounts can be extremely helpful while introducing very little risk.
These situations occur when having multiple accounts can be critical to accessibility if anything happens to the original account. This post discusses two accounts and one type of software where multiple versions are completely necessary for recovery if something happens to the original.
3 Tech Situations Where it is Dangerous Not to Have Multiple Accounts/Versions
Devices - multiple accounts
Anyone using a local user account on a Windows device who has forgotten their credentials knows it can be impossible to log back into that device without using forcible means.