A few weeks ago we weren't checking the slug for correctness. So https://community.nodebb.org/topic/2647/anythinghere was working. But if you had images in the topic in the form of !(/no/url) this was causing an api call to the topic and loading the entire topic to solve that we started checking the slug.
If we can find a solution to that image problem we can go back to ignoring the slug.
Ah right, that makes sense.
@Tanner, doesn't look like it's scheduled for v0.50. However, enhanced permissions could probably be introduced as a plugin, with the potential to be integrated to core down the road depending on the code, and opinions of the forum team.