you can grow a good plant, and at the end, it doesn't matter much whether you "flush" it or not. its got most of its growing done, it has a small reserve to live off of till the end, and, unless you go crazy and pour a shit ton of water through your pots, you'll never get all the nutes out, so it can still draw on what little you leave it. That's why someone can flush a plant and win a cannabis cup, because flushing is moot. as long as you don't draw it out more than a week or two, it really makes little difference to the plants.
the reserves its using aren't stored in your buds, its stored in the xylem and phloem of the plant, and the large sun leaves . you don't smoke the xylem and phloem of the plant, and the large sun leaves. so it makes no difference to your finished buds.
there is no benefit to "flushing".....if you don't do it too long, theres no real detriment to it either....its just doing something that has no real result, makes no real difference.....
i waste enough time in my life doing shit with no real purpose (paying taxes, voting,) to do it to myself on purpose.