"master" isn't gendered when used as a verb or adverb, and I would think masterclass refers to those usages. For example, it makes sense to say "she mastered h

"master" isn't gendered when used as a verb or adverb, and I would think masterclass refers to those usages. For example, it makes sense to say "she mastered her fears" but not that "she mistressed her fears". Similarly, "she mastered fer field" works but "she mistressed her field" does not. Really, it's just the usage as a noun that's problematic from a logical standpoint, as I see it. If the usage relates to "control" as master denotes as a noun, then it might be problematic (even if the historical use of controlling slaves is not the only use). If it refers to proficiency, or overcoming a hurdle, then it's not really related to the control aspect of the word, and the problematic history that comes along with it. Now, whether society, or parts of it, are able to distinguish those usages from each other or whether that causes contention that is better avoided, I don't know.