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I hate that about Discord. It is a fun comms application, but it is severely lacking as a community. Once, before I realized this, I recommended users of a forum use Discord. The impact was severe and fortunately brief. We all realized we would not be leaving the usual, often high value info for others, and ourselves to benefit from in the future. We unwound that mess and now carry on in the usual way. Discord has ca…
It depends very much on the discord. I'm in several discords which are excellent communities. They're really good places to hang out, get to know people interested in the same hobby, build a subculture etc. I haven't really tried one as a QA or knowledge sharing site, perhaps they're much less good at that.
The excellent communities I have been a part of can be searched. People can read it and learn. The Discord ones, unless they publish to a wiki or something, just don't exist.