I think your instinct is right and the question will probably be closed.
Whether it ought to be closed is tricky.
As you say, it's a useful question, and one about which many of our users would like to be informed.
On the other hand, it is also a question which invites anecdotal responses - "This is how I do it" or "This didn't work for me." Such answers are not exactly "opinion-based", but they're "experience-based" and their utility may be significantly qualified by answerers individual talents and opportunities.
And that raises the question, How is the user to judge which answers are good and relevant? You can't judge by "reputation", because the people with the highest reputation around here (and the people most likely to answer) are generally not people who have learned or are learning English as a foreign language - they're native speakers, so they can't offer much in the way of relevant experience.
Experienced teachers of English, or people familiar with the pedagogical literature, could provide "authoritative" and documented answers. But we don't have a lot of those folks around here - at least we don't yet.
So for the time being I think we have to fall back on the SE standard and close these questions as really not suited to the SE format - and hope that eventually we'll have enough people engaged here that such questions can be helpfully referred to Chat.