I feel like that was a cool and unique enough mark for original subreddit to give it a different vibe than most other communities with similar intent.
It also helps standardizing the titling format just enough to make it less confusing and clearer when reading them. Now that there is a brand new modding team I feel like this could be a good thing to add here
I do like it for the reasons you mentioned. Enforcement obviously is more work for mods but the consequences can be less severe. Since we can edit titles here a simple reminder ought to be enough for most cases.