about that flushing study:
so it proofs there's almost no effect between fertilizing or giving strait water, then why waste money on nutes when these don't make it inside the plant?
The study does not say that the nutrients do not make it inside the plant.
It says that there is practically no difference in a few important categories (subjective taste, mineral content, yield) depending on flushing regime.
In the video interview that I've linked above, the person who led the study even explicitely acknowledged that you can take the results either way, and save nutrients by stopping the feed 14 days before harvest. (NB the company that did the study sells nutrients.)
As far as I am concerned, I will not starve my plants unnecessarily, at no point during the grow. This makes no sense to me at all -- and that includes starving the plant of nitrogen during flowering, not doing that either.
Nutrients are not expensive enough that it would be worth going to any trouble to save two weeks worth of fertilizer.