From my prior post " If your grow medium is correctly prepared to sustain plants throughout their lifes cycles without chemical supplements you've created a living soil complete with microbe colonies that service plant requirements". That's the environment stage. Then comes the curing.
So now environment plays a role, way to back-pedal. Obviously environment plays a huge role, especially for the indoor nation. And even more so for the soluble feeders.
More than one way to do organics. You can't flush, I can. This is why my herb taste better than yours. See "cleanest smoothest smoke" ever in my thread on veganics.
For those growing in soil, either outside or in a true slow release mix indoors, FLUSHING CANNOT OCCUR, THIS IS WHY YOU THINK IT IS USELESS. Your media is full of slow release food that is not exhausted by the end, so flushing would be false.
BUT, for those growing indoors, organically, in soil-less mix, doing a heavy feeding routine. FLUSH! Again, more than one way to do organics, and If you are a heavy feeder (not a slow releaser) then a flush will be beneficial to remove as much chlorophyll pre-harvest as possible. The soil-less nature of new-school organics allows us to remove any leftover food in the container, leading to a TRUE FLUSH.
Don't take indoor advice from someone who grows outside in the ground using only teas if you are indoor using soluble food, WHOLE DIFFERENT WORLD.
I smoke indoor veganics, and outdoor organics (much like maddy's). Best in the world.