Why do people continue to give an answer that multiple people have already given to the same person?

I asked in an old post that was revived for whatever reason, why -a names are popular for girls. I got plenty of responses about -a being traditionally feminine, and got it. Over a month later, another commenter replies to me.

It's a feminine thing, as others have mentioned.

You acknowledge that this has already been said. Over a month ago. So what purpose is there in repeating it??? I'm not particularly angry at this commenter, I'm just confused and this happens pretty often to a lot of people. This isn't like a feminist theory issue where it can be debated and I wasn't convinced so a different tack was tried - It's a basic question-and-answer and it was already answered. WHYYYYY?