I haven't seen a single instance where "master"/"slave" is the most accurate technical term to be found. (I have seen instances where it's important to use those terms because those are the existing terms in some particular field / from some particular API, which the commit at hand acknowledges is a reason to keep them. So I think you're agreeing with the commit here.)

In general, most of the arguments I've seen for keeping the master/slave terms in contexts where they could be renamed without breaking compatibility are for social pressure reasons ("don't give into the mob" / "SJWs are taking over tech" / "free software should be apolitical" / etc.) and not for technical reasons.