Discord (and other non-indexable chats like Slack) is where conversations go to die and be hidden forever. FOSS and other "open" projects should be using something like Zulip, or even anything else, that can actually be indexed by Google and other search engines.

I'm a part of a few Discords, and questions are repeated over and over again, forever. People who answer the questions, get tired of answering the same thing and eventually stops helping people. In contrast, using Stack Overflow or anything else, people can search Google for answers and actually find it.