I'm against any prescriptive idea in writing. I used to hang around writers' forums, and amateur writers have a lot of really weird ideas that they are convinced are the One True Gospel and should never be deviated from.
Things like, "always show, never tell". Well, ok, it's one way to work, but if it's the only way then you've dismissed 50% of the English language's great literature as being badly written. And "no head hopping" is another popular one. Meaning, tell it from one person's point of view and stick to it (which is the prose equivalent of using thought captions instead of letting everybody in the panel have their own thought bubble I expect ). Again, perfectly fine technique, but not one you have to be a slave to. And don't even get me started on active vs. passive voice (most amateur writers don't actually seem to understand what that means anyway, they just "know" that they have to stick to whatever they mistakenly think "active voice" is, come hell or high water).
I always suspected they heard a pro mention some technique in passing as part of a talk once and took it as being the One True Gospel because "George R.R. Gaiman does it therefore we have to do it". Either that, or there are a lot of crappy creative writing courses around.
The only One True Gospel in writing is "Do anything you want, but do it well."