I have wanted the same, although, my use-case is different.
A lot of technical documentation is versioned, and typically the version is within the path. For example, Bootstrap:
https://getbootstrap.com/docs/4.6/getting-started/introduction/ (Old)
https://getbootstrap.com/docs/5.1/getting-started/introduction/ (Current)
It would be nice to be able to ignore the older versions.
I've also had issues with sub-domains - while I think you can block a subdomains in most cases, I've found nuances somewhat confusing. For example:
yarnpkg.com (Raise)
This causes sub-domains to be raised e.g. "v2.yarnpkg.com".
But once the apex domain has been raised, you can't lower a sub-domain from the search UI. But you can manually add a sub-domain, e.g. "classic.yarnpkg.com", which does work as expected.