I think some common sense in growing would be handy in this debate. Why would an unhealthy plant ever compare to a healthy plant in any way shape or form??
I think people who believe in this flushing nonsense encourage bad growing practices by telling people to feed a 5000 ppm because they can wash it all out in the end. Do you dark green clawed up leaves just heal themselves with some extra water?
Like I said plants don't "use up" anything its all used to build the plant. Some mobile nutes can be moved from leave to flower when deficient thats why the leaves turn yellow.
You cant force feed yourself 30 big macs everyday and think drinking a glass of water before bed is gonna fix it. Cannabis can absorb and store more metals than it could ever "use up" think about that when your feeding your plants because it doesn't just go away.