In slack (or discord), due to its lack of structure, if someone explained some piece of institutional knowledge, that explanation gets lost in the "slackhole". Other tools are at least marginally better at preserving institutional knowledge
with slack, it's easy to have a thread with 15 different answers which are all slightly different.
The "knowledge retention" features I'm looking for is being able to mark a thread as "this is the decision made", have that highlighted in metadata and archival, maybe be able to link off to a notion page, and have the thread closed to finalize the decision.
EDIT: the number of times I've had to kick people off a thread because they're adding bad info during a crisis reallllly drives my desire for marking canonical messages lol