This is true but what gets me is why?
I think the drip action for younger growing plants helps to draw the roots to the lower bucket quicker with gravity pulling the water/nutes & air through the medium and feeding them at the same time.Sure,once the roots are in the lower bucket the suck up the juice through the upper bucket into the plant but that upper bucket is kinda like a second root ball.
Gonna have to disagree with u here, but based only on my experience. What I found with drippers is that the rockwool cube held everything the roots needed and they didnt go searching for more. In fact I had the opposite problem when converting to DWC of trying to pull them down. If you are feeding properly and timely than these roots have no desire t o search out more. Only from what I have found.
So I believe that constant feeding to them is equally importent as feeding the root ball in the lower bucket,but I could be so very wrong on this.Plus the dripping action not only brings nutes & moisture to the upper bucket root ball but air as well.
The problem is once you are fully DWC than it is imperative to not allow the rockwool cube to become moist, as it leads to a hydroponic overwatering. I hated the drippers and the lines and the timers and the pump and the mess and the pain in the ass. DWC is like that Turkey Oven commercial from old- 'Set it and Forget it'. not really though, as problems arise much quicker in DWC.