A mentor chooses to mentor someone.

A mentor chooses to mentor someone. A manager doesn't necessarily choose to manage their report.

This means there are some kinds of feedback that a manager can't give and have it be received productively, but a mentor can.

The manager is partially the person running their part of the machine and partially the person looking out for the development and thriving of their reports.

The machine output is a survival bar to clear. "if we don't put out 5 widgets this month the team will be disbanded".

Helping your reports thrive is a term to maximize.

The shorter the time horizon, the more that managers will treat the job of manager as the former vs the latter.