[matjazdrolc]

This is anecdotal. In my search results, StackOverflow is less often the top result. Often I find solutions in GitHub issues, blogs, or first-party documentation. The bar for first-party docs has been raised in recent years - new React docs are one such example.

[gnz11]

I see the opposite occurring in my searches. The official documentation sites are usually far down the results list behind blog spam sites.