So you are suggesting forum software that supports single sign-on?
We are talking about an open source project, not a high school reunion. I don't want to hang out with people, I want to have a discussion about a focused topic.
I want to ask a question and get an answer. If the question is not one that anyone online can currently answer, I want to be able to tell at a glance if anyone has talked about my question. If I don't understand the answer, I want to ask a follow up question.
In the evening, I want to be able to take a look at new posts from that day, grouped by topic, to see if there is anything I find interesting or can weight in on.
With Discord (or any real time chat), it is hard to follow a single topic when more than one is being discussed. It is doubly hard to do so after the fact. I am aware that Discord has a forum feature. I have only seen one server ever enable it and no one posts anything to it.