Board Thread:General Discussion/@comment-39251285-20190614220200/@comment-1038387-20190614223222

It was a relic from the early days. Things have changed since then, with improved search, Chat and Forums/Feeds giving people room to ask their questions on the wiki itself. Meanwhile, the Q/A format was hacky MediaWiki that was too old to still maintain.

But the biggest was that they were big, often ill-maintained wikis with lots of short, repetitive pages and plenty of spam. It scored negatively on SEO, which could drag the entire site down.

In short: it was deleted because they should've done that ages ago.