I think that you are making an incorrect assumption about wiki posts being more important. I haven’t seen anything from the Discourse team that suggests wiki posts are any more important than any other post. Maybe you are attributing your own ideas about what a wiki post should be?
As far as I remember, the differentiating feature of a wiki post has only ever been that it can be edited by more than one user. I also checked several topics on wiki posts and didn’t find any attribution of greater importance for wiki posts, e.g. in the following topics: