2 suggestions for canonical questions:
The recently established canonical question for field switching after PhD has the following added to note to close voters:
Questions about switching from X to Y may be closed as a duplicate of this. However, please be sure that the below answer actually answers OP's question before voting to close! If the question asks about something not covered below (other than the specific fields), the question should be left open until its answers are merged into this canonical question.
I think that is a great addition and should be included in all canonical questions, as I have the feeling that often, questions that kind of fall into canonical territory get closed even though the specific answer is not (yet satisfactory) included in the canonical answer (the journal workflow is one of those).
Although canonical questions do exist, they are not easy to find as the float around in the sea of questions indistinguishable from other, non-canonical questions unless you actively click on them. My suggestion for making the canonical questions more "findable" would be to simply create a tag named canonical and ad this tag to all the canonical questions, with an explanation in the tag wiki on how canonical questions work, how people are invited to add to them etc.