Dead links and outdated pages don't just disappear; they linger in archives and...

https://stateofseo.com/should-i-301-redirect-old-urls-or-leave-a-404-the-reality-of-content-decay/

Dead links and outdated pages don't just disappear; they linger in archives and search caches, cluttering your site’s authority. When old content resurfaces, it confuses users and dilutes your SEO performance