Comment by colshrapnel

And here comes the question of maintainability. For the code, we are trying to have a single repository to avoid duplicates and to have just a single place to make changes. That's what a wiki is good for. Whereas for such a dispersed knowledge base it would be hard to keep all these atomic questions up to date.

The front page for Teams boasts it's better than your "stale wikis and lost emails" but in reality there are much more stale answers on SO than anywhere else.