At the end of the day... how much money is coming out of our pockets to deice the jet. Is it really worth the distraction of safety of operation if you even have the least doubt as to whether or not to deice? Do you think the bean counters upstairs really take notice on who deices and who does not?
Forget about money as a considertion in
day to day operations. The interim measure that affects most decisions is allocation of personel and equipment and that most often relates to an easy measure of time in the minds of all directly involved .
That's where the pinch point really is.
(I'm not arguing for or against a decision, but just pointing out a measuring tool)