Oh thank bog I'm not the only one that does that
I just imagine this bewildered tank wondering why his guard dropped off again barely 2s after he put on the squishy healer. And again. And again.
dunno why it bothers you, I never drop a guard... it's tanks decision who he wants to guard. if he guards you, it can only mean, he's not sure who will draw aggro from him more, and preffers to put guard atleast on one person, then on noone.
Don't tell tank how to tank and he won't tell you how to heal.
that's what I do on my tank, if dps are not super geared, or equally good geared, I preffer to start with guard on healer, as I don't know how dps will act, and then change guard accordingly to situation.