Besides the many other comments (esp. wrt. the moderation gauntlet problem), Stack Overflow never introduced a systematic way to differentiate answers that were

Besides the many other comments (esp. wrt. the moderation gauntlet problem), Stack Overflow never introduced a systematic way to differentiate answers that were good at the time for a version of software/environment, but become outdated over time. The users work around it on an ad-hoc basis, but often you end up reading through multiple generations of answers before getting to an answer for the current world.