there are lots of valid reasons why people dislike Discord as a platform for project bug reports & documentation, but the one I haven't seen people mention much is that most people only have transient interest in that aspect of a project, e.g. because they ran into a bug or need to figure something out from an FAQ, whereas Discord cannot service that transient need without also subjecting people to a long-term realtime chat subscription where most of the content is irrelevant noise.
this is also why I dislike mailing lists as a bug report platform, but Discord is worse because it's a for-profit platform that can only survive through engagement farming behaviours, and it inherently has a much higher volume of communications and a lower signal to noise ratio, plus many other issues that others have covered in detail.
anyway the whole thing is tedious and I'm more than happy to just not use or contribute to things where the docs/support are solely based around Discord or mailing lists or Matrix chats or whatever. I've long come to terms with the fact that these things are incompatible with me, and I'm not going to waste my time arguing with people who insist on doing things that way. that's a task for people who have more energy to burn and more control over what they burn it on.
(this is life advice I really could've used in my 20s)