One of our goals in 9.0.5 has been to address a situation we introduced in Shadowlands with Mythic Keystones never de-leveling. We received a great deal of feedback on our planned adjustment, which is currently outlined in the 9.0.5 patch notes. With this proposed change, we would reintroduce an awkward dynamic where it wouldn’t be possible to sustain running a single Mythic Keystone dungeon per week, even if you always cleared the dungeon in time, because decay would necessitate re-leveling your keys every other week.
When we created the original logic for Mythic Keystones in 2016, we wanted to make sure that players were getting Keystones that appropriately suited their proficiency in Mythic Keystone dungeons, and we wanted to reinforce the importance of clean and well-executed dungeon runs. Having Keystones decay from one week to the next accomplished both of those goals. However, in Shadowlands, we introduced the Great Vault and more Season-driven tracking of performance ...
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