I agree with WarInternal. I've used and love Discord for certain applications. Gaming with friends on FPS/RTS's is great, but it's a terrible choice for Screeps. Voice chat is the biggest "advantage" and serves no purpose here.

One of the nicest things about the current Slack setup is everything screeps related is in one place. No matter the obscure chat or group you're looking for, they have a channel. IMO this would end if we switched to discord. Individual sub-communities would create their own Discord/Slack channel splintering the community. For example, I found out about #ScreepsPlus by just browsing the channel list.

I also like to read Screeps on the go occasionally. I already have the Slack app installed for work. I'm not going to install the discord app solely for use with Screeps. I know personally I would be a lot less involved if it's moved to Discord.

This doesn't even touch on the fact we'd be giving up code snippets. No code snippet support for a programming game! There's no arguing Dicord has many great features, but it's a poor match for our use case.