I'm not the one who cast a
-1 vote on this Meta question, but I can see the reasoning behind it and its applications to the idea behind this Meta question.
Namely, I see the connection between this Meta question and an example from the proposal that I might consider voting to close: What is a "phoneme"?.
In both cases, the questions are important and can be addressed in an expert way, but I am inclined to believe that properties that them so can be better fulfilled in more poignant sub-questions.
For this Meta question, figuring out what questions to close is incredibly important, but this question and answer format may not be correct place to assemble and carry on discussion in such a list. It might be more productive to open Meta discussions on specific questions that we are considering closing.
For the phoneme question, it's interesting because underneath the dictionary definition, there are plenty of intriguing issues such as "at what usage threshold does a borrowed phoneme become a phoneme" and "what is the balance between having a phonemic representation with a cross-linguistically canonical relationship to the corresponding surface form and having one that is more theoretically suitable or minimalistic". But those questions ought to be answered individually, and not in an elaborate discussion as an answer to "What is a phoneme". That question in itself has a simple answer, and it's a Wikipedia/FAQs answer.