I would suggest (fearing flames of retribution while I do) that there should be no such thing as a too trivial question. Easy questions - when not duplicates - are questions less experienced developers have a hope of being able to answer well. If the question and the answers it gets are useful to even a small subset of users is that not the reason this site exists?
As I have said (at great length) questions too specific and questions not specific enough are both off-topic according to the help page but there is no guidance as to when these apply. Which means that niche questions, simple questions, and questions you or I might just not fancy can be marked off-topic. That's why this site is noob unfriendly. So much so that it makes SO look easy (and we all know how much of a learning curve our beloved SO has).
There should be nothing wrong with having several very similar questions if and only if the community is willing to provide answers. I fear though we have grown too quick to say, "f*** that question" and nuke it with extreme prejudice.
The fact I get quicker and better answers to WordPress question on SO suggests we have gotten something fairly fundamental wrong.
I have seen some undeniably terrible questions on SO and other sites I use that have nevertheless gathered astounding answers. Answers so good that even the badly written, poorly worded question is a valuable community resource. That does not seem to happen on WPSE.
Rather than nuking "bad" questions, we can and should educate users by upvoting good questions and solid answers - especially even half-decent answers to very bad questions. Today, I went to the "newest" tab and just (semi-randomly) upvoted some questions because not only was it a page of unloved and unanswered questions even those with answers had no votes for question or answer. That too is unique to WPSE.
In short, our own classification definitions are too broad and lack clarity. Also, we don't upvote reasonably good contributions often enough.