What is strange about Discord is this great discrepancy between the ones that love it and the ones that hate it. If I were to guess on the reason of why that might be it would be that Discord is probably really good for the people that are constantly on it, and don't really miss any communication going in. These people have probably been there for some time so they don't feel the problem of not knowing where the past…
But do you need to know the past discussions? I don't really see why this would scare away newcomers to a group any more than usual.
These people annoy existing servers members and get angry replies because people are so tired of answering the same basic question multiple times a day.
Some servers have created processes where you can only access the FAQ channel until you prove your knowledge, and only then you can enter ‘general’. That clearly shows that something is wrong with content discovery on Discord.