The purported reason seems to be the claim that some people find "master" offensive. (FWIW I'd give that explanation more credence if the people giving it seem to be offended themselves rather than be offended on behalf of someone else. But whatever, it's their repo.)

Yes, but honestly, and no offense intended, but I don't see the harm in these type questions, nor why some people are offended when they are asked. If I owed a website, I wouldn't mind it because it just creates more pages that can be indexed. I see it as helping the website. But, I did look and didn't see a simple answer. Again, no offense is intended. I've just never understood the complaints.