Arguing that the term is not more incorrect, which you have conspicuously failed to do, is missing the point. If you want to argue that a mouse is a confusing name, feel free but also note that usage doesn’t recall brutality in recent history. Masters not only didn’t usually do the same work as their slaves but the relationship was defined by the violence and permanence: your database master doesn’t torture its slaves if they make errors, or threaten to sell their children, etc. When the master died, they were replaced by their children or someone else but never a former slave. If you’re just talking about parceling out work, try to think about why you’re so attached to using “slave” instead of “workers” and how that would call your motives into question.
Using terms like primary/replica (where both do the same work) or controller/worker (where they don’t) both more accurately expresses the nature of the relation and don’t drag in unpleasant connotations.
