Recently, I asked Friendly agreement for the betterment of user involvement in interest intersecting sites (for AI related sites) for discussion regarding a feature that is particularly related to the sites that are related to the AI domain only. The question is not particular to AI Stack Exchange. The question's scope spans at least three sites on the network (say a, b, and c).
The question does not deal with all sites that are in the Stack Exchange network, as Would a "Related network questions" list be possible and worthwhile? does.
Some users are closing my question, intended for a, b, and c, as a duplicate of the question that is asking for all sites. Some users are suggesting that I should ask questions on the individual meta sites of a, b, and c for their permission.
Does Meta Stack Exchange allow a discussion that is applicable to all sites only?
If there are multiple sites that need to participate in the discussion for a feature, then should I need to discuss on all individual meta sites a, b, and c before posting here?