[malfist]

Typically "regretted attrition" is employee managed. "Unregretted attrition" is employeer managed. Regardless of the cause.

[elevatedastalt]

Regretted attrition == The employee left and the employer regrets it (They would have wanted the employee to stay)

Unregretted attrition == The employee left and the employer is glad they did. Good riddance.

[evilduck]

I’ve also seen people who were good performers but just difficult to work with that were categorized as non-regrettable.

“Hi boss, I’ve got another offer but wanted to give you a chance to counter” -> “Congrats on your new role, why don’t you go ahead and wrap up by Friday? I’ll skip over to HR and get the paperwork handled for you. Do you need a box for personal belongings?”