I agree in principle. My fear would be that if we go down this road we will end up with about 15 canonical questions that cover everything that ever gets asked on the site.
I feel like I give essentially the same answer over and over again -- all stories are moral, all stories center on a decision, linguistic shibboleths are dumb, etc.
But I think writing is one of those fields where there are a handful of basic principles that cover most things that it is possible to generalize about, but that people have a very hard time recognizing that the particular problem is addressed by those principles.
An awful lot of answers here are essentially saying, your problem is a case of this general problem and here is a general principle that addressed that problem. The principles are common. The questions are individual. The answers point from the individual question to the common principles.
I think this happens on other SE sites as well, to one extent or another, and really it illustrates a flaw in the model -- the erroneous belief that if you write a canonical answer to a defined question, everyone with that question will find that answer and recognize its relevance to their question. It is a fallacy that affects much of the content industry as well.
The genius of the web is that it contains a hundred variations of every question, and it is those hundred variations that mean that no matter how you phrase you search you will find a way to a reasonable answer. But the idea of a single universal answer to a single canonical question is a pipe dream.