The drawback is that it generally only helps the one question asker, and that answers only reflect who happened to be present synchronously and what they thought at that moment. Discord content is ephemeral and not discoverable, and tends to consist of reflexive rather than well-considered and thought-through answers.
The value of public forums is that their content appears in public searches, can be publicly linked to, and that they facilitate asynchronous, longer-form and longer-term discourse.
The value of public forums is that their content appears in public searches, can be publicly linked to, and that they facilitate asynchronous, longer-form and longer-term discourse.