Pretty self-explanatory title. With Wake of Ashes giving us 3 HP in SL, the ability should be reverted to Legion's 30 second CD instead of BfA's 45 seconds. I understand WoA got a damage buff in SL, but Ret is still on the lower-end of melee dps (especially if a fight involves any movement), so reducing its CD would likely do little to upset class balancing, while also having the added bonus of making the spec's rotation more smooth and enjoyable.
Please Blizzard. Outside of specific talent choices and burst windows, Ret is one of the slowest specs in BfA, needing a sizable amount of haste to make its rotation feel fun and satisfying. =/