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.
Disclaimer:
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.