I play only 2H Obliteration Frost, so i don’t have that much experience with BoS, but i feel it makes sense to make BoS have shorter CD, while giving it a max duration of the same CD.
For example, it has 30 second CD, but lasts up to 30 seconds. This would allow BoS Frost to be more useful in M+, Blizzard can balance it around players being able to keep it up 100% of the time. This while the player doesn’t feel as cheated out of dps when they have to move out or do mechanics?