Asking a question very often isn't just about getting the answer. Sometimes it's a way of starting a conversation, or drawing people's attention to something they might find interesting, or just introducing yourself.

The best way of answering a question here can often be to provide the information, but add something to it, such as another question. A request for the words of a song can develop into a thread that explres the meaning of the song, it's variants, where it came from, who has sung it, and what expriences people have had that link in to the song. You don't get that from a Search Engine, or even from the DT entry.

The same ind of thing goes for discussions - they maynhave happened begore, but that's no reason not to have them again, because new people arrive. Drawing attention to previous discussions can be relevant and helpful, but I hate it when it is done in a peremptory and sneering way that seems intended to shit up the newcomer.