Tags were originally introduced to improve the user experience, not for SEO. Their main purpose was to organize content and help visitors discover related articles. Back then, search engines weren't as good at understanding content relationships, so tags also provided some additional context.
Later, many people started treating tags as an SEO tactic by creating keyword-stuffed tag pages and hundreds of unnecessary tags. That worked for a while, but search engines became much smarter.
Today, tag pages often create thin or low-value content, especially if each tag only contains one or two posts. That's why many site owners either don't use tags at all or set their tag archives to noindex.
Overall, tags provide very little SEO value in 2026. If they genuinely help users navigate your content, they're worth keeping. But if you're creating tags purely for rankings, they're unlikely to help and may even make your site harder to manage.
That said, SEO is never absolute. In some niches, people still spam tag pages and occasionally see results. But that's usually because of other ranking factors, not because tags themselves are providing any meaningful SEO benefit.