If even the original author should not change their original question materially after the fact, why does it seem to be OK to allow another, relatively new, user to go on a rampage of editing dozens of others' questions and answers that materially change those questions and answers?
Take for example, this question: Why are my photos not crisp?
It's a long-standing question that has been linked to a lot of subsequent questions, many of which have been closed as duplicates of this one. As such, it is one of the "standard" questions this community often references.
While it is true that a link to an example image is dead, there is information surrounding that link that is highly material to the question. Removing the dead link and all information in the question that references that link substantially weakens the question.
In a perfect world one would be able to restore the link and/or include the image in the question itself. But absent of that possibility, do we really want to throw the baby out with the bathwater here? Particularly with a question that is over four years old and has become one of the community's "standard" questions?