I have found the title of several of my questions edited, adding the "(Catholic perspective)" clause. Yet, when appropriate, I always add the catholicism tag to them. I find the change of the title redundant. It just makes titles longer. Anyone searching for questions can see the tags below the question (e.g. here).
Additionally, not every catholicism question has such title, nor have every other from alternative denominations.
Is there an official policy regarding tags in title? As far as I can see, there is not. If this is the case, maybe we could establish one. My proposition would be to decide against this practice. But that's probably content of another post.