I can point to several niches (mostly gaming, by inclination) where there is virtually no conversation outside of a Discord. Unless you find the appropriate server, you have no peers to share with, learn from. Even if you do find that server, you start running into structural problems for information sharing: Discord's only mechanisms for permanent content are a scrollable list of pinned messages, or admin-only archive channels. If you want to share a durable reference? I can't tell you how many times I've seen cobbled-together solutions, endless pins of shared Google Docs or imgur albums. RIP, wikis.