Slack and A Forum are not comparable. Slack is largely for real-time communication which is rarely referenced historically, a forum is more of a knowledge store.
Everything is comparable! Some comparisons don't make sense because of how different they are, but Slack vs eg Discourse (not Discord) are in a similar enough realm of human interaction that it's worth taking the time to make the comparison. Especially because Slack is seen as the be-all end-all of where things live these days.
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Slack and A Forum are not comparable. Slack is largely for real-time communication which is rarely referenced historically, a forum is more of a knowledge store.
Everything is comparable! Some comparisons don't make sense because of how different they are, but Slack vs eg Discourse (not Discord) are in a similar enough realm of human interaction that it's worth taking the time to make the comparison. Especially because Slack is seen as the be-all end-all of where things live these days.
There are forums with real time components to them (live updating, online indicators, etc). That just makes slack a worse forum.