I've had PLDs clemming themselves right as I launch Essential Dignity. It's really ok with me because I can be slow and there is also the anxiety that comes with low health - no one likes being near death even for a second. It's also math. If you're at say, 30% HP then you know you're gonna die in the next 2 or 3 GCDs unless you get a heal. That is exactly why my minimum threshold is 50%.