Consider that flushing is not taught or practiced at any AG schools. Consider that flushing is not done on any other commercial crops, including smokable ones like tobacco. There literally is no scientific data supporting it.
Next, know that different people define flushing differently. Here on RIU it is in the common definitions section as putting 3X pot volume through your soil. Some will say it means going water only the last couple weeks. So your thread is going to go to shit just over this difference in defining it, which you did not do.
Next, know that flushing is sometimes done to fix massive fuck ups in your feeding plan or fucked up plant medium. Others claim it is the key to smooth flavorable smoke. The former have a point and the latter do not know what they are talking about.
Good luck with your shitstorm thread!