- I wasn't clear on this. It's more like, a community for keeping on top of a topic like LLM developments, or asking and answering questions concerning a software that's used in the organization. It can also concern processes, but where pooling answers throughout several teams works best. It's not a place for docs (that's SharePoint's role). An email isn't the good channel as the ensuing conversation would clutter everyone's mailbox.
- Some people like to chat with colleagues. It's also an opportunity for networking. Of course it's not mandatory, so if it's not interesting to you, just don't go on the communities that are "for fun".