Website Redirects can be greatly expanded to include custom additions. This is a feature that is missing from Safari (even with extensions) due to its limitations. On Safari, the site is fully loaded, compromising privacy, before it redirects.
A great use case for custom Website Redirects could be alternative privacy-focused frontends, like Nitter for Twitter. This is all while removing the original site as a middleman like in the current state of Safari.
Thanks.