Good question, but I don't know the answer. I'm tuned in for clarification.
I know for soil You use saturation as an ICU measure for a couple of days and then the drier they are after, the quicker the roots will take.
I can see a case for not doing it if going into hydro, they'd have to reacclimatize from wet to dry to wet. I can see the dry allowing an outer membrane to develop that isn't desirable, reduces efficiency in water. It can see not wanting to air prune the tips at all for structure reasons...