Often a meta question is asking for guidance about a question on the main site. For instance, this question is what really got me thinking about it, but this applies to a lot of questions. In most cases, asking on meta (rather than just closing it) is a perfectly appropriate action.
However, the OP of the question at hand does/may not know his question is being discussed at all. That seems a bit unfair. He has no way to refute any of the points made here, unless he also happens across it or someone helpfully posts a link in the comments. I've commented in this case, but I've seen many other questions where there was no signpost.
Since we have a handy "Linked" question sidebar, why not put that to good use? Specifically, if a question is linked on that site's meta, it should appear in the "Linked" column.
I understand that this may cause some back-and-forth on the meta question if the OP is obstinate, but this is surely better than taking unilateral action to form a consensus without the OP's knowledge.
Note: With the upcoming MSO/MSE split, you may want to consider linking to any meta question on that site's meta or the main MSE.
I've seen this question, and do not believe it to be a duplicate.
- That's asking for network-wide links. I'm just asking for links to meta questions that reference it.
- That question is also over three years old, with no clear [status] tag.