I have just cast two reopen votes for those closed as "primarily opinion based (POB)" because I think it is very grey area where you can't define which is POB and which is not on Language Learning.
People have their own methods and preferences in studying and learning other languages and I believe this site is designed to share them which could be opinion-based sometimes.
I am not entirely against the idea of closing POB questions, but I propose we refrain from closing questions for a month or two unless they are "blatantly" off-topic.
I think it is more important to see and understand what kind of question is well-received with upvotes and how answers to this "potentially closable" questions are voted by users until we have firm policy and guidelines.
What we need now is trial and error, not a rule which might be applicable to other well-established communities.