Slack + Talkyard
Use Talkyard together with Slack — Talkyard for questions and ideas that are good to remember long term. Slack for chatting and getting things done in real time.
Talkyard has chat features, but they're partly unimplemented. If you use Slack, Microsoft Teams or Discord etcetera already, it's better to continue using those (for chatting).
To do: Create comparison.