You can search for data years back, but you don’t have to. E.g. code troubleshooting tips are only relevant for a couple months, since the code keeps changing. The other nice thing is that you can share the findings via link of a thread or single comment with your team, and they don’t have to leave Slack to be able to see them, which is definitely a smooth experience - if they are already on Slack at that moment. In terms of search experience, it probably depends on use case, but I dont think Slack’s search is apparently worse than its alternatives like Outlook, Confluence, Jira etc. - if at all.

Agree, it's not perfect but it's better than nothing at all which is usually the alternative.