If the new function that allows guests to view Trust without requirements to log in, I think the forum should have a same new function which allows guests to view merit history without requirements to log in.
I agree that guests sometimes don't care about merit, merit system, and merit history. They even don't know what is merit, what is merit system, and their roles in our forum. However, for real users in the forum, sometimes we are in beds, or out of connections to laptops or desktop computers, and we hesitate to log in accounts via mobile devices due to security reasons. In such cases, having rights to view merit history to read and learn from merited topics/ posts   have lots of meanings and be very helpful.