My name is Lanka and I'm one of the moderators. We are 4 moderators on Buddhism SE. The other moderators are Andrei Volkov, ChrisW and Crab Bucket. You can find us here. Also moderators have a little diamond next to their name. That is how you can recognize them.
English is also not my first language. I struggled to learn it in the past and nowadays, I develop it by writing, speaking and reading it everyday.
Maybe it will make more sense, if you got some info about this site. This site is a Stack Exchange site. This means that we have a "Best-Answer-Format". We are looking for expert answers and the best answer possible. Opinion-based answers tend to not generate that kind of answer.
There will always be some degree of opinion-based content in an answer or question. That cannot be avoided.
The opion-based questions that are being put on hold, are ones that tend to generate a large amount of opinion-based content, discussions and debates. This site is not suited for discussion and debate.
The Stack Exchange Format is for best answers and not discussions and debates.
Stack Exchange is about questions with objective, factual answers. We've been crystal clear about this for as long as I can remember, even back to the earliest, pre-beta days of Stack Overflow. It's right there in the standard Stack Exchange FAQ:
What kind of questions should I not ask here?
Avoid asking questions that are subjective, argumentative, or require extended discussion. This is not a discussion board, this is a place for questions that can be answered!
Thus, questions that are not answerable -- discussions, debates, opinions -- should be closed as subjective. It seems simple enough: Fact good; opinion and discussion bad. But why?
Most forums and chat rooms have a scale problem. As in, they don't. The more people that join the discussion, the more noise each of those connections bring. So the forums get progressively noisier and noisier, and suddenly one day … you stop learning.
-- Good Subjective, Bad Subjective and What types of questions should I avoid asking?.
Actually, we are fairly open-minded at Buddhism SE. On other SE's the moderation is done in a much more strict way. Often we have questions here, that are allowed to stay but would have been immediately down-voted and closed on other SE's.
I want to also mention that sometimes moderators who have been on the site for a long time and are very experienced can very quickly evaluate whether or not a question should be put on hold, so they put it on hold.
Other times, the question might be a difficult one to evaluate and then the question is being discussed amongst the other moderators so a solution can be found.
It is often a difficult balance to keep the site in check and ensure good-quality content and at the same time perform moderation, that are agreeable to everyone. That means that sometimes there are "grey-areas", where the individual moderator interpretate the Site-policy and then act on that. These situations are the most difficult and challenging to moderate.
Its a learning process for everyone. Remember our site is still in Beta and when a site is in Beta, it is very important that the moderators ensure a healthy beta with high-quality-content.
Lastly, thank you pointing out that moderators should leave a comment when questions are put on hold. We often do that but sometimes it might slip. We are aware of that and will do it as best as we can. Its very good when there is community-feedback since that will make the overall quality of the site increase.
I hope you will continue to like it on the site. Feel free to always contact a moderator if you have any questions or issues on the site.