I think this is the main disconnect for people.
What a lot of technical people want is a forum. They want to have every problem discussed one time and then if someone brings it up again they can link to it and not have to discuss it again. This exists, it’s called stackoverflow and if technical people want someone to close their question as “already answered” or “off topic” they can go there.
Most discord communities though aren’t attempting to build a permanent corpus of knowledge carefully curated and searchable. Instead it’s basically the polar opposite, someone can show up and ask the question that every beginner stubs their toe on and people answer it and chat with them and help them learn.
It is more work for the people giving out the help, but it is seems like it’s what new users want. A place they can ask a question and get an answer or get someone to ask them questions to improve their question.
A lot of technical people get blinded by their own knowledge. Indexable searchable information is great if you know what to search for, but new people seldom do and they don’t even know the right way to formulate the questions. Asking other human beings that know what they are doing is a good way to learn stuff. Discord facilitates that, people like that, and no amount of highly technical people kicking their feet and holding their breathe and shouting at the communities “you are doing it wrong, you need a highly curated forum where questions are never asked twice” is going to stop human nature.