How does a recirculating DRIP system create a vortex that strong to drain ?

That is about the only system I have not used yet. But how can it be worse than flood and drian in causing a vortex to strangle roots. Have you seen what goes on in aeroponics. The roots are blasted most of the time.

I would have to see the system empty with no rocks and watch the water flow without obstruction. I just don't think that water dripping from above is moving in volume enough to cause a drain vortex strong enough to do damage.