I changed the Manual of Style some weeks ago to decomission it so I delete it when I see it. I sent a notification to this wiki userbase about the update this was a part of.
Now, all articles are be considered in universe by default unless they have the realworld tag. Most wikis i went through operate as such and i did not see much of a reason to continue using that practice of the previous admin team.
I'm always up for debate but I really don't see much advantage about using it to be honest with you, especially considereing we put a mythos era tag already.