I support showing everything on Meta.
The OP of the original MSE post makes a compelling point in my opinion, which is that important topics that are being discussed might go unnoticed if a post is hidden. Agreement or disagreement with the post is irrelevant, as both heavily downvoted posts and a heavily upvoted posts speak about the consensus on the topic - which may have also real-world (site) ripercussions.
Seeing the post in the first place is necessary in order to keep up with the consensus on new situations and with potential shifts in consensus on old situations. And obviously to form an opinon and express it, even when the number of votes has settled the overall consensus already (are we allowed to further upvote a post that has +8 upvotes but not to further downvote a post that has -8 downvotes?).
Furthermore Meta is a place of discussion, and silencing unpopular opinions (to me) kinda feels like censoship.