A Discord is not a substitute for a website. Or a support forum. Or an issue queue.
Or really pretty much anything besides maybe IRC or Matrix if you're not worried about the openness of the chat platform.
@geerlingguy I strongly want to agree with you, but I really cannot. Having a place to cowork and hang out with people to mutually help each other figure out issues as they come up is a blessing and this is what discord does best.
It is a place where you can have a text chat, a forum, and a voice- and video chat all at once. And this is pretty brilliant.
But it is not meant to be an archive, and this is the huge upside of support forums and the other things you've listed.