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I think the biggest problem in creating discord is management,and if Mofu manages the whole discord alone, it will be even more harder.At present, you can also see some spams on itch from time to time,if discord is mixed with some troublemakers, it will be more troublesome.Of course just my personal views, I also think following his itch and communicating in itch are enough.
The last time I asked about a discord here, Mofu said he was planning to create a server at some time in the future. It's sad if the plans has changed, but oh well.
The server itself shouldn't be a place for FAQs or anything, it should be treated as a hub for the fans to talk, share or suggest/ask things, or for the dev to post sketches, WIPs, gather feedback etc. Some platforms even have integrations with discord, like for paying roles if one has a crowdfunding platform enabled like Patreon or SubscribeStar, but it's not the case with Mofu. Of course, it must be administered and managed by a person Mofu can trust, because no way Mofu would handle that himself, it would take too much time, so I kinda agree with you it would be kinda useless and pointless to implement a discord serv for now.