I don't want to devolve fragile's thread and I understand Kratky but what I don't understand is this.
Everytime a dwc or hydro grow goes wrong it's always the same old thing, more oxygen and fewer light leaks. This argument, to your point, doesn't take into accout the kratky method but that also has little to do with my point, PATHOGENS and the enviroment in which they breed uncontrollably.
My cloner has light leaks, no oxygen and pretty much everything that should contribute to root rot but it didn't. Yet my undercurrent which is much better built with more oxygen and no light leaks has been a haven for root rot with the addition of root rot killing applications as well.
Growing green above wasn't my point but more so growing brown below was.