It is impossible to find URLs elsewhere that reference a changed or deleted website.  Webmasters of those other cites often make no effort to confirm hyperlinks are valid.  That would cost money.  Business school graduates don't like that.

Many IT people do not get it.  They just arbitrarily change URLs for the same information.  Since the naive always assume change is good.  Even if information has a new URL, the old URL should still reference it.  At least for the next ten years.  But that means a IT guy understands how the world really works.  Many only understand what they feel.
 

glatt wrote:

Some information should be removed.

I was so frustrated during the pandemic trying to get good information about specific situations after a covid exposure or covid test result, and every single search I did gave me information that was months out of date.  I'd be looking for current CDC recommendations, and there were a million pages that said they were "current" but had dates well in the past. Once information is old and has been superseded, it should be archived somehow.  Flagged so search engines ignore it unless you put "archived" in your search query.

Yeah, this is a serious issue.I think folks have gotten caught up in the idea of the internet as the repository of all human knowledge but forget that knowledge is evolving. I work in peoples homes and would love to have clear guidance about how soon I can return to a house after people have been sick. I'd also like that guidance to be based on transmission potential rather than boosting the economy.