If communities could easily form and include both chat and message board functionality, that could be really neat. I'm imagining realtime chats for specific events.
Kind of like if Discord and Twitch chat had a baby. More dynamic and short-term than Discord.
There is a use-case for real-time chat as you mentioned though. For eg. a community of baseball fans will need a real-time chat during an ongoing game and they shouldn't need to switch platforms for that.
Also, the intent is to be a platform to support communities for small-businesses since most of them do not use communities for their benefit in the same way as big corporations do it.