Because sometimes no one actually answered that question, quora just publishes many titles to index to google.

Engagement optimization. 5% of users might happen to see something that will keep them on the site, but 95% are confused and waste their time. Sites only optimize for engagement these days.

This has been one of my biggest gripes with Quora, even if user answers are useful, I’m not seeing them, which defeats the whole purpose of the site.