DET useless in healers?? ah?

[lebirath]

hey..
so i have made my character based on spell speed > DET; but once in a while i run into a gear/weapon that putting 2 materia of speed would waste the second, so i m inclined to put DET on it.
Did so on one piece and run into a friend that told me DET is pointless in healers.. have read forums and google and keep finding a mix, so decided to open this thread in hope i can get a clear discussion about it..
anyway.. the point that i keep running into is..

determination affects healing done TO you, not BY you. In other words: Determination is worthless on healer, and good on a tank.

This is incorrect. Have no idea why people continue to spread this mis-information.

as you can see ppl reply to that as incorrect but keep running into ppl in forums and in-game that continue to point that out.

ah?? After all if DET would be pointless why so many of my "to-be" allagan gear of healing has so much det on it?? SE did a gear for healing with a stat that is pointless in healers? that just sound wrong.. Also run into a few thread of det vs spell speed whrn i was deciding which stat to go with, why would so many opinions about which one is better if det is pointless??

i understood DET as affecting the healing that i do (per gamerescape definition) no the healing that is done on me. (but eng is not my 1st language)
sorry, running into this at this stage has me quite traumatize.. lol
thx for reading and any reply