I wish all software products would do that. Chat applications are like a busy town square where everybody is yelling into the crowd and important information doesn't survive the moment, while a discussion forum will eventually grow into a public library which preserves information and makes it searchable (assuming that search engines have access to the information of course).
Huh? Have you not used the search feature in Slack or Discord? Whether it's a forum or a chat, the data structure is largely the same, especially with Slack/Discord as they have threads.
I can search Reddit with Google. I can’t search Slack with google. So if you are using it as a repository for information or troubleshooting or what have you, it is completely worthless outside of its use for the people in the actual community/on that client, e.g. slack/discord. Whereas a thread on Reddit, HN, etc. that addresses some issue I am having is discoverable to everybody.
Let me put it to you another way: how many tech problems have you solved by searching Google and finding a Reddit thread, and how many times have you solved one by finding something on a Slack or Discord server you weren’t already a part of?