Personally I'm ok with discord for private social communication, imo not everything needs to be archived or searchable. But there's people/devs who use discord as a knowledge repository and that's the recipe for disaster imo.

The recipe: Old problem questions, solutions, how to guides, ... All hidden behind a login wall and if you do get in, then you still have to contend with the crappy search engine, so you might just as well ask the probably already answered question yet again. And one day it's probably all going poof or behind some kind of paywall. Basically also what quora has been trying to do for years, but I don't think any people with more than a few braincells complain about quora being hard to access, since most of their content stinks anyhow.