In 5.4, gone will be the days where Resto Druids had to build up stacks of Lifebloom on a tank when tank swaps took place. Now, when you switch your Lifebloom to a new target, all of the stacks will move to that new target.
This is a fabulous change for Druids. It will also make it much more crucial for Druids to ensure that they don’t accidentally let stacks fall off their target, since it will be a significant HPS loss.
Hopefully this is one that sticks around for when 5.4 goes live.