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Discord is on a quest to become a better messaging app
(www.theverge.com)
This is a most excellent place for technology news and articles.
Recently I launched Discord on desktop and got big splash screen screaming about new shop items. Earlier, I've got constant popups about new nitro perks, new avatar decorations, new app icons.
You may get an answer immediately, but this answer will be lost after some messages. Someone with the same question may ask it again instead of searching. People in chat may get tired to answer over and over. On forums you have one question 10 years ago and answer to it. No need to ask again.
Discord's internal search is very limited, not as good as Google. Discord is very hard to archive, so at some point information will be lost.
If you have many servers, you'll get many notifications and new messages badges. You'll also have many useless channels, which you need to manually mute or hide.
I don't really think encryption is mandatory for every chat app, it has some problems with transferring messages to other devices. If you're working on some project, you probably don't want it to be leaked, so you'll encrypt your messages.