#13 - March 10, 2017, 7:48 p.m.
Good question.
When we made the Glorious Tyranny enchant during the Mists of Pandaria expansion, we went for maximum cool looks. Unfortunately, the result has proved to be negative for computer performance.
Our artists regularly make performance improvement passes on things like this, and this particular enchant visual is one of their priorities for Patch 7.2. They're doing what's necessary to improve performance when this enchant is active, but as you can see, the look has changed a bit.
We’re trying here to balance helping players who are having issues and restoring the original appearance, but ultimately there's going to have to be a small change in how it looks.