Flushing is a myth, are u joking???.
You wouldn't flush if you are making hash or whatever but to have good clean smoke flushing hard metals like iron and so on out of your smoke a given. A myth god, what a load of horse shit.
BTW your weed will taste similar to horse shit if you don't flush or at best cut down on any micro nutrients or hard metals that are in all micro and most nutrients these days
Trust me. I didn't flush a coco plant proper and the ppm was 1000 after I checked and it was fine right up until after a months cure it brought out all them chemicals. Especially if you are using synthetic nutrients you HAVE TO FLUSH. Organic you will get away with it but even then why not flush. It finishes off your plant and it'll finish eating everything. Just soft flush for a week or do 2 hard flushes over 4 days.
Flush, what's the worst it'll do. But if you don't you can't take it back, so, I'll leave u to make up your mind.
Good luck man