None of those are reachable without an account and in many cases an invite (private by default), they are not indexed by search engines, they are proprietary, cannot be exported or archived, etc.
It's asking for knowledge to be lost.
You say that like it's not already happening. It's happening. Many technical chats are only happening on discord now. Everything single day the volume of current technical knowledge gets smaller.
Why do people want to share information someplace that gets lost to the sands of time?
I mean, it’s the same reasons people used IRC for decades, and some people were unhappy if channels saved and published the IRC logs.
Informal asynchronous communication arguably has its place, and many people are more willing to speak plainly and without overthinking if what they say is not expected to be publically readable for decades.
Even if, of course, in public chat rooms someone could always record and share what is said without your consent, and if most people don’t say confidential things in public chatrooms about technical topics, there’s still something about a mailing list or forum that makes me personally speak less plainly compared to ephemeral channels.
We don't want casual discourse to be indexed to the public. Instead we'll host a wiki system soon that bubbles up technical chatter into worthy articles.
Is that a reasonable compromise?
My concern is more the trend of open groups, even open source projects, centralizing around discord both for dev discussion, community discussion, and technical support. There's incredible value to those discussions to be indexed and searchable on the web, like the good old days of public forums. Actual work took place in public, on mailing lists and forums. It could be indexed and scraped, even just archived to my local machine.
The problem the “bubble up to Wiki” is that you need a specific subset of people with the technical know-how to understand the issue and solutions AND the time and desire to update the Wiki.
One thing that can help is being absolutely a tyrant and insisting that discussions about bugs, etc happen on a bug tracker- or at least the resolutions go there.
But the fact that Discord itself can't search Discord is beyond stupid. It's just a void of knowledge, people help other people, answer questions
And then they do it again, because search is completely useless.