Andie, I think when people do a final flush it is to get the nutes and chems out of the SOIL more than the plant. I believe this is to force the plant to use the rest of the nutes that it already has stored in itself...

Ive heard people say they are better off without a final flush, as it will decrease the final yield of the plant. My plant already doesnt have the best size, so im trying to find out if a flush will take alot away from my yield, IF that is one of the side effects of flushing.