With stack overflow you can effectively ask help and obtain useful support to practical issues, boost training for new personell and sharing knowledge and best practice in your Company.
The main benefits I see are:
- familiarity with StackOverflow - everybody knows what it is and how to use it,
- knowledge is not lost in Slack - and the Slack-SOfT integration also helps. Also, the same things are not repeatedly rediscovered, as they're documented,
- compared to static pages of documentation (e.g. Confluence) - the nuggets of knowledge are much more piece-meal, and it's easier to keep them up-to-date (through swarming and reminders about the Content Health review),
- Articles serve the purpose of longer pieces of documentation quite well.
Also, the initial implementation was pretty painless - as always, the biggest challenge was to make the organizational change happen, so the content starts to appear there, and engineers ask questions and search for answers in SOfT first.